No matter how hard they try to play it for laughs, they couldn't cut down on the nightmare fuel that is the Nazgūl.
Venom's level in Marvel Super Heroes. It's loaded with Spider-Man: Web of Shadows levels of symbiote goo which you can get caught in, the enemies are half-possessed symbiote victims, and then there's Venom himself. Special mention goes to Venom's rather unexpected Jump Scare.
Venom can also become a Big Fig (similar to Hulk and Abomination). Only problem is he literally TEARS HIMSELF IN HALF to do so! With the looks, and the screeches of pain, it looks very horrifying. Considering that he shows a host inside hime during his battle, the transformation must be excruciating.
Lizard's grab involves him eating his opponent.
Ant-Man's special has him shrink himself further than in normal gameplay, enter his opponent's body, and explode them from within.