The Super Friends investigate when "The Invisible Menace" causes the disappearance of a professor and his latest invention. Next, the Wonder Twins intervene when an "Initiation" rite goes awry. Later, the Super Friends unite to stop "The Coming of the Arthropods." Finally, Wonder Woman and Rima aid three geologists after they inadvertently invade a tribe's sacred burial ground and are sentenced to the "River of Doom."