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Dr. Mikhail Cossack is a brilliant scientist who became the false main antagonist in Mega Man 4.

He sent a letter to Dr. Light challenging Mega Man to defeat his Robot Masters, claiming that he would prove to the world that he was the greatest robotic scientist in the world. After defeating Cossack's robots, Mega Man rushes to Cossack's citadel in Siberia, where he meet the doctor and fights him. However, before Mega Man could defeat him, Proto Man interrupts the battle, along with Cossack's daughter, Kalinka, who was kidnapped by Dr. Wily. Wily was using Cossack for his mad schemes. After Wily is defeated, Cossack befriends Dr. Light and makes Mega Man a pet bird robot named Beat as a gift for defeating Wily again.

Mega Man Villains
Mega Man Classic

Bass | Cossack Numbers | Copy Mega Man | Dark Man | Devil Series | Doc Robot | Dr. Cossack | Dr. Wily | Evil Robot | Gamma | Genesis Unit | King | King Army | Light Numbers | Mega Man Killers | Ra Moon | Robot Master Tournament Contestants | Stardroids | Sunstar | Terra | Wily Numbers

Mega Man X

Berkana | Bit and Byte | Colonel | Colonel Redips | Doppler Army | Double | Dr. Doppler | Dynamo | Epsilon | Gareth | Gate | General | Grizzly Slash | High Max | Isoc | Lumine | Magma Dragoon | Mavericks | Mechaniloids | New Generation Reploids | Nightmare Investigators | Nightmare Phenomenon | Rebellion Army | Red | Red Alert Syndicate | Repliforce | Sigma | Vile | X Hunters | Zain and Geemel

Mega Man Zero

Copy X | Crea & Prea | Dark Elf | Dr. Weil | Eight Gentle Judges | Einherjar | Elpizo | Fefnir | Four Guardians | Kraft | Mutos Reploids | Omega

Mega Man ZX

Aeolus | Atlas | Master Albert | Model W | Pseudoroids | Serpent | Siarnaq | Thetis


Mega Man Legends

Bonne Family | Birdbots | Bola | Glyde Loathe | Klaymoor | Lex Loathe | Megaman Juno | Mistress Sera | Reaverbots | Servbots |

Mega Man Battle Network

AirMan.EXE | Bass.EXE | BeastMan.EXE | BlastMan.EXE | BlizzardMan.EXE | BowlMan.EXE | BrightMan.EXE | BubbleMan.EXE | BurnerMan.EXE | CircusMan.EXE | CloudMan.EXE | ColdMan.EXE | ColorMan.EXE | CosmoMan.EXE | CutMan.EXE | Cybeasts | Dark MegaMan.EXE | Dark ProtoMan.EXE | DesertMan.EXE | DiveMan.EXE | Duo.EXE | DrillMan.EXE | ElecMan.EXE | ElementMan.EXE | FireMan.EXE | FlashMan.EXE | FreezeMan.EXE | GravityMan.EXE | HeatMan.EXE | JudgeMan.EXE | KnightMan.EXE | LarkMan.EXE | Lord Wily | MagicMan.EXE | MagnetMan.EXE | Net Mafia Gospel | PlantMan.EXE | PharaohMan.EXE | QuickMan.EXE | ShadeMan.EXE | SparkMan.EXE | StarMan.EXE | StoneMan.EXE | SwordMan.EXE | VideoMan.EXE | World Three

Mega Man Star Force

Andromeda | Cepheus | Crimson Dragon | Dr. Regal | Le Mu | Mr. King | Patrick Sprigs

Non-Canon

Constellation Droids | Dimensions | Dr. Wily (Mega Man Fan Film) | Dr. Wily (Mega Man TV Series) | Origami Man | Proto Man | R-Shadow | Robosaur Park Dinosaurs | Slur | Vespor Woman