Every orphan needs a dad, so why not use Billy's? He's in the bush somewhere, so Billy leads his new friends into the nevernever to find him: nine young shoeless orphans, ten if you include Amber, plus four dogs and a baby kangaroo.
What could possibly go wrong? How about a kidnapping? A spearpointed standoff with the police? Or what about a runin with a dangerous gang?
You might need oxygen for this one because it's going to leave you breathless.