Nightcrawler's Hyper Moves

Old Oak Tree from Castle of Illusion

Beast and Iceman Fight Spider-Man Villain Trapster

Power Stone Edward Falcon in all bonus stages

Eye of Agamotto and more

X-Men Team Up: Colossus and Iceman CPU Co-OP against Anaconda

Mega Man and all bonus stages - Mega Man Robot Master Mayhem fan game

X-Men’s Iceman Takes on the Hydra

I think I already saw this somewhere...

New boss: Mr. Negative