Christopher Lloyd plays Doc in the live action cut scenes, but the simpsons' Dan Castellaneta (Homer Simpson, Abraham "Grampa" Simpson, Barney Gumble, Krusty the Clown, Groundskeeper Willie, Mayor Joe Quimby, Hans Moleman, Sideshow Mel, Itchy, Kodos, Arnie Pie, Scott Christian, Squeaky Voiced Teen) plays Doc in the show. Thomas F. Wilson returns to play Biff and the many incarnations of him throughout time, and Mary Steenburgen returns to play Clara. Also has some short science experiments with Bill Nye, his first appearance on television, which led to him getting his own show "Bill Nye The Science Guy". Bill nye never speaks and oddly enough, sometimes they are narrated by Christopher Lloyd, sometimes Castellaneta.
These are all VHS and TV rips, but of fairly high quality. enjoy