Frankly, I'm surprised it has taken so long for this to happen. In the early to mid-'70s Bill Cosby
did three films with Sidney Poitier (who also directed) called Uptown Saturday Night
, Let's Do It Again
, and A Piece of the Action
. The films aren't exactly related in a narrative sense - they feature different characters, in different cities - but are clearly related in that they feature Cosby, Poitier ...