The Colonel or Mikhail Arkadin is a member of the Soviet military and the leader of Koshmar Gulag. He is a henchman of Valentina Vostok and Vandal Savage and an antagonist in the series Legends of Tomorrow.
While Ray Palmer, Martin Stein and Leonard Snart break into Vostok's facility, they find out that Vostok is planning to create a Firestorm for the Soviets. While Stein tries to get the core to prevent Vostok from succeeding with her plans, Palmer heads for the controll room to deactivate the core. However, Snart is taken captive by Vostok who tells Palmer that she would kill Snart should he not immediately repower the core. Though Snart tells Palmer that she would kill him anyhow, Palmer reactivates the core. When her turns around. The Colonel stands behind him and tells him that he had better listened to his friend before knocking him out. Eventually, Mick Rory arrives to help Snart and the rest, but they are overpowered by the Colonel's men. While
Snart escapes with the core, Rory, Palmer and Stein are captured by the Colonel. When he tells Vostok that Snart escaped with the core she tells him that it doesn't matter, as with Stein captive they now have the real Firestorm. The prisoners are then brought to Koshmar Gulag.
When Stein refuses to give up the formula to stabilise the Firestorm, the Colonel visits Palmer and Rory in their cells. He and his men then bring the both prisoners down to Stein's cell and straps him to an electric source, torturing them in front of Stein's eyes. At first only electrocuting Rory, he eventually beats Palmer with a hammer after the latter insults him to save Rory from more pain. Eventually, Stein breaks and promises to give Vostok the formula.
When the rest of the team arrives to save their imprisoned friends, a prison riot breaks out. During the chaos, Rory, who is dresses as a guard, sees the Colonel shoot at prisoners and pushes him into a cell, imprisoning him with another prisoner. He leaves the screaming Colonel behind, who is presumably killed by the prisoner. However he is most likely killed in the explosion of Koshmar.