Iron Man's support of the Superhuman Registration Act led to a civil war among heroes.
Scarlet Witch altered reality in "House of M," causing massive chaos and loss.
Hulk's rage destroyed a planet in "Planet Hulk," leading to countless deaths.
Cyclops became the Dark Phoenix, resulting in the deaths of fellow heroes.
Wolverine betrayed the X-Men under brainwashing, causing significant harm.
Reed Richards formed a secret group, making controversial decisions that endangered many.
Black Panther spied on fellow heroes, undermining trust and unity within the Avengers.