The final appearances of Bill Bixby and Lou Ferrigno in the roles of David Banner and the Hulk,The Death of the Incredible Hulk (1990) marks the conclusion of the trilogy of made-for-television movies which resurrected the beloved series (which ran from 1977-1982).
We also have the original love story between Banner and the Black Widow, which Joss Whedon would later rip off in Avengers: Age of Ultron (no, we can't prove it!).