Two sailors and a Wren (the UK version of an American W.A.V.E.) are struck by lightning in Stonehenge and transported back to the first century and the court of the Roman emperor. There, they run afoul of Nero, who is about to have them beheaded when they remember and predict events in the history of the Roman Empire and are appointed court prophets. Empress Poppaca plies her feminine wiles on one of the sailor, Tommy, and this further complicates an already-delicate situation. Lots of songs, comedy and a cross-dressing masquerade.