- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
The commanding officer of the S.S. Ariel, Markel is an older man with brown hair. He wears a gold command uniform shirt. When his ship is investigating Lactra VII in 2269, he abandons his ship in orbit in an attempt to find the missing members of his crew. Luckily, he and the survivors from the Ariel are rescued from the Lactran intergalactic zoo by Captain Kirk and his crew from the U.S.S. Enterprise.