Jeff Conaway

Jeff's sister, Michele, is an actor as well.

Jeff played Danny Zuko in the Broadway production of Grease (1978) before playing Kenickie in the movie version.

Jeff's second wife, Rona Newton-John, is the sister of Olivia Newton-John, his co-star in Grease (1978).

Jeff worked on Grease (1978) with John Travolta and had to stoop in scenes with him to make Travolta appear taller.