He appeared on the ‘80s Incredible Hulk cartoon, and later, both the ‘90s Iron Man and Incredible Hulk animated shows (voiced by Max Headroom actor Matt Frewer). He then popped up Avengers ...

But before he makes his proper MCU debut, let’s explore the villain’s gamma-irradiated past in comics and cartoons. As expected, the Leader’s comic past is primarily as a Hulk villain and ...