John Allen Nelson is an American actor best known for his role as Walt Cummings in the fifth season of the action adventure series 24.
Allen has also been a series regular on Baywatch, Sheena Queen Of The Jungle and was main credited case member on the drama thriller Vanished and the action series 24.
He had recurring roles in the courtroom drama Matlock as well the soapies Santa Barbara and Loving.
He has had guest roles on the television shows Murder She Wrote, Booker, Heartbeat, Hunter, Quantum Leap, CSI Miami and Friends.
He has also had roles in the made-for-TV movies Perry Mason: The Case of the Lethal Lesson (1989), Rich Men, Single Women (1990) and XXX's & OOO's (1994).
Allen's film credits include :
Saigon Commandoes (1987)
Warriors from Hell (1988)
Killer Klowns from Outer Space (1988)
Taking Liberty (1993)
Criminal Passion (1994)