The Law's Legionnaires have been summoned by a friend of Justin to discover the whereabouts of one Professor Moran, whose museum expedition in the Pacific has vanished. Unfortunately, their search ends up with them being shipwrecked at sea.
Crimson Avenger [Lee Travis]; Speedy [Roy Harper]; un-named gang of crooks (villains)
Washing up ashore on a strange isle, the Crimson Avenger and Speedy go about building an abode for themselves, then set out to look for the other Legionnaires. They run into a bunch of thugs, who capture them and leave them to drown while they make themselves comfortable in the home our two heroes had constructed. Once captured, the two leave them to search out their mysterious leader: The King.
Green Arrow [Oliver Queen]; Vigiliante [Greg Sanders]; Baby-Face Johnson (villain)
Green Arrow and Vigilante come ashore on an island and not only discover an aquarium, but a notorious criminal named Baby-Face Johnson. The outlaw is told by a member of his gang that a group of scientists are on another island and are collecting rare samples of fish, and King Baby-Face decides to do something about it.
The Knight and the Kid arrive aboard Winged Victory in time to help stop criminals threatening Professor Moran and his museum expedition but are captured until the Professor's "fish-catching device" saves the day.
William and Jonathan show up to save Wing and Stripesy from being shot, and discover the King doesn't own the islands as he said, and were using the two as slave laborers for his own benefit. Then the Kid and the Shining Knight show up to corral some of the other villains, but poor Professor Moran is overcome by the King, who then makes plans to take care of the Legionnaires when they show up.