I was not a quatum leap fan. But I did like his roles in the Dunwich Horror and Dune. These movies take place in what I would call "odd" universes.
He was IMO rather odd looking and that also made him stand out.
variety.com
He was IMO rather odd looking and that also made him stand out.

Dean Stockwell, Actor Known for ‘Quantum Leap,’ ‘Blue Velvet’ and ‘Married to the Mob,’ Dies at 85
Dean Stockwell, a veteran actor with credits including 'Quantum Leap' and 'Air Force One' has died at 85.
