Filmography from Gregory Sierra

Actor :

Vampires, John Carpenter, 1998
...

The Clones, Lamar Card, Paul Hunt, 1973
A nuclear scientist is "cloned" by foreign agents, struggles against terrifying odds to prove he is himself and not the clone. Producers note that the word Clones was rarely, if ever heard in the American vocabulary before this picture was released...

Beneath the Planet of the Apes, Ted Post, 1970
Astronaut Brent is sent to rescue Taylor but crash lands on the Planet of the Apes, just like Taylor did in the original film. Taylor has disappeared into the Forbidden Zone so Brent and Nova try to follow and find him. He discovers a cult of humans that fear the Apes' latest military movements and finds himself in the middle. Tension mounts to a climactic battle between ape and man deep in the bowels of the planet. Sequel to "Planet of the...