Without consulting the family while leaving Marty and Jennifer alone, Doc takes Clara and the boys back to the Middle Ages, in 1367, to escape the technology that he feels his family has become so reliant upon. Leaving the DeLorean that goes back to their home turf, Doc angers Clara, and Jules and Verne leave them. Once there, Clara is kidnapped by the evil Lord Biffingham and Doc is thrown into the dungeon. Jules and Verne meet up with Harold McFly (Marty's ancestor), whose lady love, Jennivere (Jennifer's ancestor, almost), has also been kidnapped by Lord Biffingham. The boys and Harold arrive at the castle in time to witness a "jousting" match between the Lord and Doc. Clara escapes from the tower and makes a hot air balloon out of silk and a tapestry loom. As a true heroine, she rescues Doc and foils Biffingham's evil scheme. Doc realizes that he should have consulted her before making anymore decisions for the family. When Harold and Jennivere are together again, Doc, Clara, Jules, Verne, and Einstein head back in their home turf to visit Super Splash Water World, where Verne was expecting to go.
(Synopsis courtesy of Wikipedia)

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