Astronaut Tom Trimble and his android double Hermes are deposited at the court of King Arthur after an accident at Nasa leads to the space/time continuum being warped. Tom becomes embroiled in a plot by the villainous Sir Mordred, who is looking to overthrow the king with the help of the wizard Merlin. Disney family adventure, starring Dennis Dugan, Jim Dale, Kenneth More and Ron Moody.

A NASA spacecraft proves Einstein right when, traveling faster than light, it ends up near King Arthur's Camelot. On board are big-hearted Tom Trimble and Hermes, the look-alike robot he built. Tom immediately makes friends with pretty Alisande while becoming enemies with the evil knight Sir Mordred. It seems Mordred has joined up with the Sorcerer Merlin and they are both up to no good. It is now up to Tom to try and use 20th century technology to foil their plans.