Mark Slade was in 2 episodes of Rawhide.

12/15/61. ‘The Gentleman’s gentleman’. He played a Bellboy in the hotel. Also starred Eric Fleming and Clint Eastwood.
We’re still finding a source for this.

10/2/64. ‘The Enormous Fist’. Mark played a young man, Adam Grant, confronting and dealing with a man responsible for his Pa’s death. Also starred Eric Fleming.