Carry On Venus was originally titled Carry On Jack. A parody of seafaring epics, this one takes place in 1805 (give or take a few years). Kenneth Williams stars as Captain Fearless, doing battle against pirates, mutineers and the Spanish Armada (in 1805?) The recently released Marlon Brando version of Mutiny on the Bounty is mercilessly lampooned throughout. Aiding and abetting the usual gang of "Carry On"-ers are newcomers Juliet Mills and Bernard Cribbins.
by Hal Erickson synopsis