An oil-field worker from Texas journeys to Australia to look for his missing sister, and his search winds up getting him involved with a violent drug-smuggling gang.
In order to become a member of a fraternity, the applicants have to go through initiation rituals to show their loyalty. Way back in the 1960s, someone played a nasty trick on the student Sidney Scheider: He had to take a bath in a tub filled with cornflakes and coffee grounds, vinegar and even more disgusting substances. Nothing unusual so far but someone had replaced the water with pure acid. Sidney was seriously wounded and died a horrible death. This year Acid Sid returns with a vengeance, killing everyone who comes his way. One by one is slaughtered and in the college hell breaks loose.
A young woman running a wildlife sanctuary in the Australian outback is in for trouble when she is confronted by three kangaroo hunters. Bored with killing kangaroos, they decide to kill the animals in the sanctuary, and when they see how attractive the owner is, they decide to have a little "fun" with her, too. Turns out that they may get a bit more "fun" than they bargained for.
In Australia, four teenagers in a Sydney theater are astounded to hear the news that a nuclear war has broken out in Eastern Europe. They try to figure out the best way they can survive the coming conflagration.