Participants Episode(s) Result
Atlas Huntsmen vs. Centinels "Ace Operatives" Won
Ace-Ops vs. Geist "Ace Operatives" Won
Marrow and Weiss vs. Sabyrs "Out in the Open" Won
Ace-Ops vs. Team RWBY "With Friends Like These" Lost
Ace-Ops vs. Penny "Strings" Retreated


Marrow is the youngest and newest addition to the Ace Operatives team. Prior to the start of the series, he graduated from Atlas Academy, joining the military as a Specialist.

Before becoming a Specialist, what drove Marrow to be a Huntsman in the past was that many people said Marrow couldn't ever be one.[1] However, beating those odds, Marrow was able to rise to the top of the ranks, becoming an Ace-Op. He is extremely appreciative and humbled by James Ironwood for being brought in as a part of the most elite group of Huntsmen in Atlas, being well aware of the social and racial tensions between Atlas and Faunus and how rare it is for his kind to be placed in such a role.[2]

Following the Fall of Beacon, Ironwood enlisted Marrow, as well as the rest of Ace-Ops, into his secret group with the goal of stopping Salem and her forces through the use of the Amity Communications Tower.


In Mantle

Marrow and his team confiscate unauthorized weapons

Marrow and his team were called into Mantle because of reports of a stolen Atlesian airship entering its airspace and because of the unauthorized use of weapons by civilians. The culprits were Team RWBY, Team JNPR, Qrow Branwen and Oscar Pine, who defended the city from a pack of Sabyrs. Marrow and his team caught them by surprise and seized their weapons before leaving them in the custody of the authorities.

He is later seen retelling how he was kicked out of a place at least three times to his team before the Huntsmen-in-training arrived. Following the release of their quarries, Marrow and the rest of Ace-Ops apologize for the miscommunication, before the students are introduced to Atlas Academy by Penny Polendina.

Episodes Covering These Events

Geist Hunt


In the mission to the Schnee Dust Company Mine #2, Marrow and Harriet Bree join Team RWBY in the mines. He complains about being signed up as a babysitter, which Harriet deflects by saying that's what she is to him. As Weiss Schnee and Blake Belladonna discuss the Schnee Dust Company, Marrow explains that society in Atlas is set up to put the Faunus in the bottom, and humans are willing participants by not helping. Marrow and the rest of the team encounter a Geist, who flees deeper into the mines, and a swarm of Centinels. He later defeats the Geist in the caves along with the rest of Ace-Ops.

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Marrow was present after teams RWBY and JNPR were officially received their Huntsmen licenses, along with Elm Ederne and Vine Zeki, helping the new Huntsmen and Huntresses break into their professional field. Following this, Marrow joined the Ace-Ops and Huntsmen in preparations, where he formed a bond with Jaune Arc. He also aided the teams' training, and went on another mission to the SDC with Blake Belladonna and Yang Xiao Long to help clear the Grimm from the area.

Episodes Covering These Events

Patrol at Robyn Hill's Election Party

Marrow during his patrol at the Election Party in Mantle

Following Jacques Schnee's announcement of having "been forced" to close down non-essential Schnee Dust Company facilities, Marrow and Penny were tasked with making sure the elections for Mantle city council went smoothly, as bodyguards for Robyn Hill. The election party Robyn chose to attend was crashed by Tyrian Callows, who massacred partygoers and framed Penny for murders, putting the blame on Atlas.

The Happy Huntresses and survivors attacked Marrow, Ruby, Lie Ren, Nora Valkyrie, and Penny, though Marrow froze them temporarily with his Semblance, his attempts to help being ignored. Marrow and the group left, swearing the attacks weren't being staged by Atlas. Soon after, Creatures of Grimm arrived to attack the city, where Marrow lamented they'd have a long night.

Episodes Covering These Events

A Banquet at the Schnee Manor

Marrow is quick to recognize systemic societal issues.

Marrow later attended the dinner at the Schnee Manor, as one of Ironwood's guests. After realizing all other Faunus at the party were waiters rather than guests, Marrow left to go outside with Qrow in frustration, on standby in case Ironwood needed further evidence in defending his seat in the council.

As Jacques and the council continue raising issues toward Ironwood, Weiss enters, saying Jacques should be tried instead. She shows the group footage of his interaction with Arthur Watts, and the council turns on him for aiding the man they then believe to be behind much of what Ironwood had been blamed for. As those assembled in Schnee Manor enumerate Jacques' crimes, including the murders at Robyn's rally, they receive messages informing them of the crisis in Mantle; with the heating in the city disabled, riots and Grimm are approaching the city.

Episodes Covering These Events

Battle of Mantle

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Marrow, along with the rest of the Ace Ops and Ruby's Group (bar Oscar) deploy to Mantle in an airship. The flight is interrupted by a pair of Teryxes, who destroy their Manta and forces the group to eject into the city below. In Mantle, Marrow teams up with Weiss, where the two of them defend citizens from the Creatures of Grimm, joining forces with the Happy Huntresses.

The group is slowly overwhelmed and tired by the hoardes of enemies, causing the people of Mantle to demand to be evacuated to the city of Atlas. broadcast is sent out to all of Mantle and Atlas by Ironwood and Robyn which Ironwood reveals the existence of Salem and links the recent murders in Mantle to her minions Tyrian Callows and Arthur, while Robyn uses her Semblance on him to prove it to all be true. The two encourage everyone to stand together due to Salem's goal being to divide them. Ironwood reveals his plans involving the Amity Communications Tower, claiming it is ready for launch and tells the civilians they will be evacuated to Atlas.

Episodes Covering These Events

Martial Law

Marrow and Weiss continue to help until they are suddenly called back to Atlas Academy under direct orders from Ironwood. Team RWBY and the Ace Ops go to Ironwood's office, where he reveals that one of Salem's subordinates left a black queen chess piece on his desk. He begins panicking, questioning if everything that he and the others did was part of Salem's plan. Ironwood questions whether or not Team RWBY really is on his side and asks them how Robyn knew about the Amity Tower project. Yang confesses that she and Blake told her, leading to an argument. The argument becomes more and more heated, and suddenly, a Seer bursts out of Watts' bag, dies, and breaks open to release a smokey apparition of Salem.

Salem proclaims that Watts and Tyrian's mission was not to secure victory, but rather to set the stage for Salem herself. She then attempts to convince Ironwood to surrender but is soon distracted by Ruby delivering a speech about how they learned the truth about her from the Relic of Knowledge and will still stop her even without killing her. Salem tells Ruby that Summer Rose once said those same words but was proven wrong, causing Ruby to break down crying with her silver eyes flickering and flaring.

The Salem apparition disappears, and Marrow begins to panic, especially upon realizing that the proximity alarms along the coast near Atlas are inactive. Blake asks about the readiness to launch the Amity Tower, but Yang realizes that Ironwood just said that to lure out Watts. Ironwood then explains that he intends to raise the City of Atlas into the atmosphere instead of Amity Tower. There, the city, the two Relics and the Winter Maiden will be safe from Salem. Team RWBY protests that this plan would mean leaving people in Mantle to die due to the evacuation not being complete, but Ironwood refuses to reconsider.

Suddenly, Jaune opens a group call with Ruby, Qrow and Winter. Taking the opportunity, Ruby uses her Semblance to get past Ironwood and warn the others about his plan. Ironwood locks communications, declares that Team RWBY are under arrest, and leaves while the Ace-Ops get ready to detain them.

Marrow vs. Weiss

As RWBY and the Ace Ops prepare to fight, Marrow hesitantly asks Harriet if their plan really is to fight. Harriet insists they'll let RWBY decide, and the Ruby initiates a battle. Marrow faces off against Weiss in Ironwood's office, trying to talk Weiss into surrendering peacefully despite knowing she's used to getting what she wants. Weiss ignores his orders, and continues to fight. As Ruby and Harriet's fight returns to the office, Harriet yells at Marrow, telling him to stop holding back against RWBY. Marrow insists that he's only trying to arrest them, and that she was taking things too far, seeming as though she wants to kill RWBY. Harriet does not deny this, and instead says it's necessary.

Due to his hesitance and unwillingness to fight, Weiss defeats Marrow, knocking him unconscious. She and the rest of RWBY then tie Marrow and the Ace Ops to their Gravity Bolas, and leave them in Ironwood's office.

After Clover's fight with Tyrian Callows, Marrow and the remaining Ace Ops grieve over their former friend with Ironwood and Winter. When Sleet and Camilla arrive in a rage at Ironwood's decision, the Ace Ops are shocked to see their leader kill the councilman.

Ace Ops vs Penny

When Ruby, Weiss, Lie Ren, Nora Valkyrie, and Penny arrive breach the Atlesian Command Center, the Ace Ops confront the group under orders to capture Penny. The five of them confront the group in a large room, where Vine and Marrow attempt to talk Penny into coming with them and surrendering the Relic of Creation to Ironwood for safekeeping. Harriet and Elm accuse Penny of stealing the Winter Maiden powers from Winter Schnee, depriving her of her destiny, and goad Penny into fighting alone. Penny is eventually subdued, but when the heroes attack the Ace Ops, they lose control of her. Ironwood starts to order reinforcements, but Watts stops him, ordering the Ace Ops to swipe one sword loose from Floating Array. Completing this goal, the Ace Ops retreat with the weapon, Marrow appearing conflicted at this.

Reuniting in Ironwood's forces, where Harriet dismisses Ironwood's praise, claiming that "good work" would have been capturing Penny. Marrow and Harriet later return Watts to his cell, where the latter accuse Qrow of murdering Qrow. This angers Robyn, who nearly goads Harriet into a fight before she is stopped by Marrow.

As Ruby begins to send out a broadcast to the world about Salem, the Relics, the Maidens, and the ongoing situation in Atlas, Harriet angrily switches off the screen that which the rest of the Ace Ops and Ironwood were watching it. During the speech, Watts switches out a chip in Penny's sword, hacking her and causing her signal to disappear. After being told Penny was likely rebooting, Ironwood angrily throws his Scroll at Watts, leading to the Scroll becoming broken. He then orders Winter Schnee to take the Ace Ops and search for Penny.

En route to Penny, the operatives intercept and open comms broadcast from Yang's Group. As Winter, Harriet, and the group begin to argue, a series of earthquakes shake the tundra and Mantle, and soon after, the river of Grimm produces a massive geyser that manages to puncture Atlas' Hard-Light shield, leaving the two groups in shock.

The Ace Ops then arrest Yang's Group in the Solitas tundra. Upon seeing Monstra, Jaune points out that that is where The Hound took Oscar Pine, but some of the Ace Ops insist that Grimm do not take prisoners. Winter contacts Ironwood, who informs her of a plan for her and the Ace Ops to carry a bomb into Monstra to blow it up from the inside. This sparks concern from Jaune, Ren and Yang, who fear this would endanger Oscar, and they insist on rescuing him first.

Winter listens to the Ace Ops and Yang's Group debate, silently conflicted. Jaune attempts to convince Winter to let them rescue Oscar by saying the Ace Ops could use them as a scouting team, but the Ace Ops feel it is foolish to risk three lives to save one ally. Ren stands and argues that no one is replaceable, and he soon notices that his Semblance]has a new ability - reading emotions. With this ability, he realizes that the Ace Ops have been fighting how they truly feel about each other, and he even looks down at himself, seeing his own true emotions. Harriet and Elm are angered by Ren verbalizing how they truly feel, and Winter steps in to prevent a fight and states that they will go through with Jaune's plan. Harriet objects, but Winter pulls rank to silence her and tells Yang's Group that they have a time limit. The Ace Ops drop them off, and just before Ren exits the ship, he tells Marrow and Winter that they no longer want to be part of any of this.

Episodes Covering These Events

Battle of Atlas

Marrow is later present on the battlefield with Team FNKI and the Ace Ops holding the Grimm back whilst awaiting the payload, commenting on how Team FNKI are just kids before getting shut down by Elm. When the payload arrives Marrow objects pointing out that Jaune, Ren and Yang are still inside the creature asking Winter how would she tell her sister that she killed her friends. Marrow remains uncomfortable with the order despite Winter's reassurance and is seen carrying the payload towards Monstra with the others when a kinetic strike hits the creature destroying it and surrounding Grimm in a blinding flash and explosion that knock's Marrow and the Ace Ops to the ground. Marrow appears distraught as the dust surrounds them, panicked and worried for Jaune, Ren and Yang's safety and fate. Like the others he is recalled back to Atlas Academy by Ironwood and learns of Cinder's attack and the escape of Qrow and Watts.

Episodes Covering These Events


After learning of Ironwood's plan to use the bomb to destroy Mantle as a way to lure in Penny, Marrow speaks up to his team regarding this and even towards Ironwood as well, claiming his rank used to be worn with pride but now he sees it for what it's worth: a collar. Just as he turns to leave, Marrow freezes to the sound of Ironwood cocking his gun to shoot him for insubordination, but is then beaten and arrested by Winter before he could be shot.

Marrow helps Qrow and Robyn restrain the Ace-Ops

However, once out of sight and in the elevator Marrow is freed and Winter explains she just saved him. After Winter contacts Weiss for help in stopping Ironwood, the duo bump into Qrow and Robyn. Marrow plays his part in stopping Ironwood by helping Qrow and Robyn secure the bomb and stopping Harriet, Vine and Elm with his Semblance when they enter to try and stop Qrow and Robyn. Marrow continues to freeze Vine, Elm and Harriet as Qrow and Robyn begin restraining them when an AK-200 under the control of Watts enters and charges at the group self destructing. Marrow takes the blow of the explosion breaking his Aura whilst Harriet escapes with the bomb. Marrow joins Elm, Harriet, Qrow and Robyn in witnessing Atlas falling into Mantle and both cities becoming flooded with a distraught expression on his face as Harriet attempts to comfort him.

Episodes Covering These Events


RWBY/Justice League
Minor Characters