- 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
Brilliant scientist and James Kirk's former lover. Lester used an ancient life-energy transfer machine to swap minds with Kirk in 2269. Lester's charade as Kirk ended after ordering the entire senior staff executed.