A chief petty officer aboard the USS Enterprise under Christopher Pike, who joined the landing party to Talos IV and later helped man the laser cannon aimed at the Talosians' hidden lift.
Garison is a chief petty officer serving on the USS Enterprise in 2254, seen in the first pilot, The Cage, and again in the footage reused for the two-part episode The Menagerie.
He is on the bridge when the ship picks up the old distress call from the survey vessel SS Columbia, and he beams down to Talos IV with Pike, Spock, Tyler, Boyce and the ship's geologist, where the party finds what appears to be a camp of ageing survivors.
After Pike is seized and taken underground, Garison is among the crew who bring down a heavy laser cannon and fire it at the rocky knoll concealing the Talosians' lift. The beam seems to do nothing, though the Talosians later reveal that this too was an illusion. He was played by Adam Roarke.