Assault, if you're setting a campaign in Brisbane in the 80s, then I assume you're aware of this guy. He had a Kung Fu school in Fortitude Valley, and would make a great villain in a Dark Champions style game.
Other than that, interesting things from Australian history that might be fun for a superhero campaign are:
Nuclear testing at Maralinga included tests on soldiers who had to travel through the area only a few days after a test, and they also problems keeping the indigenous people out of the test area.
During World War II, the Japanese were rumoured to have landed troops at the River Styx in Queensland. They were apparently killed by locals and buried on an island at the mouth of the river. My father worked in the area in his youth (in the 1960s) and heard this story from locals at the time.
Some convicts thought there was a secret white empire 300 miles south-west of Sydney. (from Girt: The Unauthorized History of Australia)
