The Game of Death (1978)
Bruce Lee began filming this martial arts epic before he left to make ENTER THE DRAGON, and soon after passed away. The film was completed with new footage (and actors) spliced with fight scenes already filmed by Lee, including a fight with basketball legend Kareem Abdul-Jabbar. Colleen Camp co-stars in this film about a movie star who fakes his death in order to uncover a plot against him. FYI, footage of Lee's real life funeral was used in the film.
I just watched this and it's 'sequel', and GoD 2 would definitely be a better riff. The 'plot' doesn't even make sense and entire scenes do not even need to be there. Of course, riffing both might be glorious!
Not only does the editing look like it could have been done by Ed Wood, the acting is god-awful.
Alvin George commented
Who DIDN'T get a kick out of a cardboard cutout of Bruce Lee's face superimposed over a double? LOL