This episode is available on the "Spider-Man: Return of the Green Goblin" VHS/DVD, which you can buy from the BUY SPIDER-MAN STUFF section of this site.
This episode originally aired before
the Venom/Carnage episodes. Consequently, Tony Stark's brief appearance and
the whole portal technology didn't make any sense until after the Venom/Carnage
This page is a part of DRG4's Marvel Cartoon Pages:
Featuring Spider-Man, X-Men, Fantastic Four, Iron Man, Incredible Hulk, and the Silver Surfer.