Marooned in Britain in 23 AD, the Dwarfers need an 8-volt battery to power up their Returner Remote and get home. Remembering a lesson from school Rimmer suggests they make a battery out of lemons but the nearest lemon to Britain in 23 AD is in India 4,000 miles away. They begin their journey, a journey that will ultimately lead them to a meeting with a historical A-List Celebrity that could alter the entire history of civilisation.