Gates is a criminal accomplice of gangster Jackson Farrell. Partnered with each other, they rob the Monarch Bank of a quarter of a million dollars and flee to the small islands of the South Pacific to hide out. After Gates leaves Farrell, he departs to establish an alibi, and Farrell discovers the Castaways of the S.S. Minnow on the Island. gates eventually returns to pick up Farrell, but the stolen money gets tangled in their anchor line and chopped up in their propeller. Gates also discovers Farrell's gun is ruined by water when he tried shooting Gilligan for being a nuisance. After leaving the island, both Gates and Farrell are arrested by the Coast Guard.
- Gates was played by actor K. L. Smith