Admiral Robertson was a character in Friday the 13th Part VIII: Jason Takes Manhattan, played by Warren Munson.
Admiral Robertson was the captain of the SS Lazarus cruise ship that a group of graduating senior students from Lakeview High School had boarded to visit New York City. He is the father of Sean Robertson, while in the ship's cabin he and Sean argue over the procedure of how to correctly set sail.
During a violent storm Admiral Robertson briefly leaves the wheel, while he is gone Jason Voorhees kills his first mate. Admiral Robertson returns to the cabin to find the first mate's dead body, Jason then appears from behind and slits his throat with a machete.
Admiral Robertson's body is later found by Sean and Rennie.