According to Robert Hood, 'A reclusive doctor experiments with the brain and memory, seeking the secret of life in order to revivify his dead wife'.
The Australian Centre for the Moving Image expands slightly on this synopsis, saying that 'At first glance the film's plot reads as a retread of Rocky Horror, minus the tunes. A young couple picnicking on the beach come across an eccentric cross-dressing doctor who is involved with some bizarre experiments involving some very stressed out monkeys. Faster than you can say timewarp, the innocent couple are embroiled in the doctor's fiendish plans to reanimate his dead wife.'
Sources:
Australian Centre for the Moving Image (http://www.acmi.net.au/oz_summer_secrets.aspx). (Sighted: 6/7/2012)
Robert Hood, 'Killer Koalas: Australian (and New Zealand) Horror Films'. Tabula Rasa (http://www.tabula-rasa.info/AusHorror/OzHorrorFilms2.html). (Sighted: 6/7/2012)