- 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
Native of the Vidiian Sodality. Dereth was the "honatta" for a fellow Vidiian named Motura, which meant that he was responsible for finding replacement organs for Motura as his organs failed due to the Phage. In 2371, Dereth abducted Neelix from the U.S.S. Voyager, and removed the Talaxian's lungs to be implanted into Motura's body.