I jsut taught of this, what about the special Cartoons All-stars to the Rescue? If they had done it a bit earlier like the 1982-1986 time frame. The Smurfs and Bugs Bunny would still be part of it, but the rest of the cast might differ, GI Joe, Transformers as well as the Filmation's toons like Fat Albert, He-Men, She-ra would had appeared. Garfield got only tv special then but the Peanuts gang could had done a cameo.
If it was done a bit later around 1993-1995, the X-Men and the 1994 Spider-man would had done cameos.