The Marvel Super Heroes Adventure Game (SAGA) role-playing game used an innovative card-based "Fate Deck" mechanic. It was written by Mike Selinker, and despite being generally well-received, it failed to achieve wide-spread commercial success.
The series was cancelled approximately one year after it began, leaving three planned supplements to never actually be released. The unpublished supplements were:
The Marvel Team-Up Roster Book was essentially the Spider-Man extension, and even got as far as having an ISBN assigned, and cover artwork released. But sadly it appears to have never reached distribution.