Duckula travels to England to hear the will of the Duke of Mallardborough. When it is revealed that the Duke was murdered, many different suspects are interrogated. The investigation begins to focus on Duckula, who is coerced into confessing. He is put on trial and, just before the verdict is announced, the Duke appears, alive, and states that his death was a hoax.

The Egg, an evil mastermind, needs the castle as part of his plan for world conquest. To distract Duckula, he sends him on a fake spy mission.

A famous world explorer is hired by Von Goosewing to challenge Duckula to a race around the world. Though Von Goosewing cheats, Castle Duckula still finishes first. Still, Duckula is denied the grand prize.

Dr. Quackbrain, a deranged psychiatrist, convinces Duckula to take part in an experiment and traps Duckula in his Dream Machine. It becomes up to Nanny and Igor to enter the dream and save the Count.