X-Men II: Fall of the Mutants (DOS) -- Avalanche and Pyro Level

The levels/boss arrangements are completely random in X-Men II: Fall of the Mutants (DOS), but here's a video depicting Archangel, Havok, Dazzler, Phoenix, and Cyclops taking on Avalanche and Pyro (along with a bunch of Indians and barbarians). Sometimes the bosses attack promptly and out of nowhere -- like Avalanche here -- but other times it can take quite a while to find them! A full review of the game is here:
It really is more fun than it looks. :)