The Gullagaloona Backpackers arrive in London to collect their inheritance from their founder. They fortuitously stumble across the Winjin' Pom and get him working. However, two gangsters, Ronnie and Reggie Crow are themselves after the van, having left something in it.
The loot left by the Crows inside the Pom turns out to be an old, scratched record of a famous Australian opera singer, which J.G. Chicago is coveting. After being wrongly put in jail and escaping thanks to Bruce, the Gullagaloona backpackers return the stolen item to its rightful owner, the old Lady Studemare, who rewards them... by allowing them to listen to the record, much to their chagrin!
The travellers decide to sell the Pom after he puts them in trouble with a duo of vicious bull bikers, thus replacing him with a similar-looking campervan. Fortunately, it comes in handy to fool Ronnie, Reggie and Howard.
The backpackers arrive at a spooky mansion. However, Ronnie and Reggie have followed them, trying to get their hands once more on the campervan. Unexpected help comes from Raymond and Mavis, two ghost bats who are distant relatives of Frazer.
While being chased by the Crows, the Pom hides in a scrapyard. However, the vehicle is accidentally placed in an incinerator. To escape, Pom shrinks himself and the others inside (although Bruce escapes). Within 12 hours they will be back to normal size. However, Ronnie and Reggie see this as the perfect opportunity to please their boss, J.G. Chicago.
The Crows kidnap Adelaide as part of a plan by J.G. Chicago to lure the backpackers and Pom into a trap. Afterwards, the vulture cajoles the campervan into working for him. Will he realise where his true loyalties lie?