When Rick Jones and Johnny fly on the bike Scarlet Spider, Cyclops, Jean Grey, Gambit, Wolverine, and Storm can all briefly be seen (as well as a hand that appears to be the Juggernaut).
Cameo appearances by Spider-Man, the X-Men (Cyclops, Phoenix, Nightcrawler, Storm, and Wolverine), and the Juggernaut.
Season two, episode nine, "Nightmare in Green", shares a similar plot to The Incredible Hulk (1996) season one, episode seven, "Doomed", in which Doctor Doom wants the power of the Hulk.
When the Thing crushes Doctor Doom's hands at the end of season two, episode nine, "Nightmare in Green", the injury carries over to the future.