One Step Beyond : Navigator (1959)
Directed by John Newland
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Synopsis by Hal Erickson
On a ship sailing through the China Seas, First Mate Walter Blake (Don Dubbins) follows directions written on the captain's blackboard and changes course. Angrily, the captain (Robert Ellenstein) confronts Blake, insisting that he had never written such instructions. It turns out that the course was changed at the behest of a mysterious stowaway (Olan Soule)--who is completely unable to explain his actions.