This classic comedy has Will Hay as a bogus sea captain, Ben Cutlet. He is tricked into taking command of an unseaworthy ship, the "Rob Roy", which the owners intend to sink.
He and two stowaways escape on a raft to an island inhabited by cannibals. The natives are frightened into friendliness by the radio set, which the trio stole from the ship. Ben and the stowaways recapture the "Rob Roy" from the crooked crew, whose efforts to sink her have proved in vain, and sail home in triumph to their native town.