British hunter Thorndike vacationing in Bavaria has Hitler in his gunsight. He is captured, beaten, left for dead, and escapes back to London where he is hounded by German agents and aided by a young woman.

The Marx Brothers take on high society. Two lovers who are both in opera are prevented from being together by the man's lack of acceptance as an operatic tenor. Pulling several typical Marx Brothers' stunts, they arrange for the normal tenor to be absent so that the young lover can get his chance.

Based on elements from the stories of Mark Twain, this feature-length Claymation fantasy follows the adventures of Tom Sawyer, Becky Thatcher and Huck Finn as they stowaway aboard the interplanetary balloon of Mark Twain. Twain, disgusted with the human race, is intent upon finding Halley's Comet and crashing into it, achieving his "destiny." It's up to Tom, Becky, and Huck to convince him that his judgment is wrong and that he still has much to offer humanity that might make a difference. Their efforts aren't just charitable; if they fail, they will share Twain's fate. Along the way, they use a magical time portal to get a detailed overview of the Twain philosophy, observing the "historical" events that inspired his works.