A member of the seven-person crew of the shuttlecraft Galileo, killed by the giant inhabitants of Taurus II after Spock posts him alone as a sentry.
Gaetano is an Enterprise crewman, a radiation specialist, who joins Spock's expedition to study the Murasaki 312 quasar-like formation in the first-season Original Series episode The Galileo Seven. He was played by Peter Marko.
When the shuttlecraft Galileo crashes on Taurus II, Gaetano and Latimer scout the surroundings and are attacked by huge, primitive humanoids; Latimer is killed by a spear. Gaetano joins Boma in pressing Spock to strike back, but Spock will only allow phasers to be fired to frighten the creatures.
Spock then leaves Gaetano on guard by himself. The creatures return, disarm him and kill him among the rocks. Spock recovers the body at some risk to himself, an act that does little to ease the crew's resentment of his coldly logical command.