The Uninvited
When a shady businessman (Alex Cord) attempts to dodge the law by sailing off to a remote island paradise, he brings along a bunch of young spring break revelers. However, when a cat escapes from a dangerous scientific experiment and makes its way on to the boat, the passengers soon discover that it is harboring a deadly secret.
Director: Greydon Clark
Starring: George Kennedy, Alex Cord, Clu Gulager, Toni Hudson, Eric Larson