American character actor who played Kevin Uxbridge, the apparently human survivor who is really an immortal Douwd, in the third-season Next Generation episode The Survivors.
John Anderson (1922 to 1992) was an American character actor with hundreds of film and television credits. He played the car salesman in Psycho, appeared several times in The Twilight Zone, and was MacGyver's grandfather Harry Jackson.
In the third-season Next Generation episode The Survivors he plays Kevin Uxbridge, an elderly botanist found living with his wife Rishon on the only untouched patch of the devastated colony Delta Rana IV.
Picard works out that Kevin is a Douwd, a being of vast power who, in grief at his wife's death, destroyed the entire Husnock species with a single thought.