Swashbuckling action adventure set in the mid 17th century. George Baker stars as Earl Anthony - aka The Moonraker - a gentleman Cavalier who is the thorn in the side of Oliver Cromwell (John le Mesurier) and his mission to rid Britain of the royalists. Feared among Cromwell's men, the Moonraker has already effected the escape of over 30 royalists to France, a feat he pulls off by assuming the identity of a Puritan scholar. However, his audacious actions run into trouble when he attempts to lead Prince Charles Stuart (Gary Raymond) to safety after a defeat at the hands of the Roundhead soldiers.