Kaiser, while trailing two of the dumpers, falls into the lake, directly in the area they've been dumping atomic waste. His body is transformed into that of a monster .. The Monster of Phantom Lake. He soon begins hunting two groups of campers. One of those groups include five teenagers who have just graduated from high school. The other includes a scientist, Professor Jackson, and his graduate student, Stephanie Yates. One person after another falls victim to his deathly hugs, until only three survive.