Dr Claw plans to drill into the Earth's crust in order to warm his ice lair - meanwhile, Inspector Gadget is the centre of attention at a town's annual Inspector Gadget Day.

When Quimby learns Thelma is being sent back to ancient Rome, he sends Gadget to stop her. Gadget is also anxious to meet his ancient Roman relative, Gadgetorum. First stop is the Colosseum ...