Dudley (Brian O'Shaughnessey) operates a nature reserve and is very set in his ways. He doesn't really want any help (though with various wild animals running rampant and a gang of poachers led by Dudley's nemesis Kimber (Victor Melleney) on the reserve he surely needs some).
He grudgingly accepts Larry (Bruce Millar), a ranger transferred to help him. Larry manages to get on Dudley's good side despite their different methods and outlooks on life causing some conflict early on but then Larry gets involved with Sally (Tessa Ziegler) who just happens to be Kimber's daughter...
Despite the title we don't get to see much in the way of rogue lions in this film, we do see troublesome hippos, wildebeests and crocodiles. The nature footage is the best part of the film but the rest is a perfectly reasonable film if not overly exciting.