The Beachcombers

Jet-Boat Gemini (3x8)

Air date: Nov 10, 1974

A ruthless imposter masquerades as Relic, with an identical jet-boat. Relic is blamed for a series of increasingly impudent crimes until Gus and Margaret finger the Imposter, and the two jet-boats clash head-on in a ferocious dog-fight to the death.