Adventures of the Queen (1975)

A madman hijacks the luxury cruise liner, S.S. Queen, and threatens to blow it up unless a millionaire pays him the the contents of a safe deposit box.  Neat little thriller complete with a very cool surprise plot twist.  Produced by Irwin "Master of Disaster" Allen.

Robert Stack, David Hedison, Lara Parker, Ralph Bellamy, Bradford Dillman, Russell Johnson.