15 Times MCU Heroes Actually Killed

10. Ant-Man Killed Yellowjacket - Ant-Man

Scott Lang isn't your everyday killer. He's not even your everyday hero. He's essentially just a father driven to extreme circumstances because a bad decision from good intentions ruined his life. To imagine him as a stone-cold killer is pretty unthinkable, but Yellowjacket ranks right up there with the most over-zealous, passionate villains in the MCU.

Because he himself is driven by vengeance and the perceived injustice in his treatment by father figure Hank Pym, Yellowjacket wouldn't be likely to stop and as soon as he takes the fight to Lang's home and threatens his daughter, there can be only one outcome.

Scott's answer is to go to the limits, turning himself subatomic to break into Yellowjacket's suit and basically making him implode - in a particularly harrowing sequence - before proving it's possible to get back from the Quantum Realm at the same time. Quite the achievement for a petty thief.