- (November 2002) Plays The Visitor in "The Spitfire Grill" musical by James Valcq and Fred Alley (Laguna Playhouse, Laguna Beach, California, USA).
- Played the role of Mr. Dark in Ray Bradbury's Pandemonium Theatre Company October 1, 2003 production of "Something Wicked This Way Comes" at the Edgemar Center of Arts in Santa Monica, CA.
- (1977) Mark performed in a Kentucky Fried Chicken commercial in Nashville TN for a KFC new product, "Hot and Spicy" chicken. The Colonel Harlan Sanders showed up on set with a box of "Hot and Spicy" chicken, shared it with the cast and made a cameo in the spot.
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