Marooned?

A middle-aged science fiction nerd role-plays as his favorite space hero out in the desert when he hits his head and becomes convinced he is a space hero for real. When he starts to suspect his role-playing buddy of being an enemy alien, what started as a ridiculous fantasy game becomes a matter of life and death.

• 
  Michael McCafferty

  Commander Walcott
• 
  Justin Roiland

  Cadet Moore