Heading back to Milwaukee 1957 in less than 5 minutes, an unseen vampire materializes on the ship and zaps the controls landing the gang in Transylvania, spookiness ensues.
Fonzie is pulled out of the time machine and materializes in the palace of the evil Ming Fu in Ancient China. Ming Fu finds out about the time machine and seeks it out.
The Time Machine lands in medieval times where it is turned into a tree by Merlin the magician. The Dark Knight kidnaps young King Arthur so he can claim Camelot for himself. So, Fonzie takes Arthurs place in a joust.
The Fonz and the Happy Days Gang end up in England 1899, where they meet Sherlock Holmes. The gang tries to stop Moriarty from stealing the Crown Jewels and using the jewels in a fiendish plot.
On route to Milwaukee 1957 the gang in their time machine get stuck in a time storm emanating from the Bermuda Triangle, where they meet Ula and her giant ape Mondo and some villains.
In 1692, Fonz and the gang end up in Salem for the Witch Trials and are up against both the Judge, falsely accusing witches, but also the Witch of Salem, crashing ships on the rocks.