Captain Caveman and the Teen Angels answer an urgent message from their friend Peter Price and travel to a distant island. Gentle Mrs. Jordan, heir to a great fortune, is frightened by the disappearance of her four children. Discovering the contents of the will that granted Mrs. Jordan her fortune, our heroes prove that Orville, Icarus, Jezebel and Jordan are attempting to frighten their mother off the island to gain control of her fortune.

Lani and Rick's wedding is about to be cancelled when the famous Manipoa pearl--given to Lani's parents by Rick's parents to end the feud between the Kehemas and the Palis--mysteriously disappears. Cavey and the Teen Angels volunteer to help their friends, and they discover that Rick's brother Dan stole the Manipoa pearl, knowing that the theft would stop the wedding and give Dan the chance to win woman he loves: Lani.Cavey and the Teen Angels accidentally break through the time barrier and are transported back the prehistoric era. Delighted, Cavey introduces the Teen Angels to his parents, but he discovers that his father, the tribal chief, is to be dethroned by the evil Gort. Cavey and the Teen Angels go into action to reveal Gort's underhanded intentions to the High Priest--and Cavey's father retains his rightful throne.

Brick Markham escapes from prison and uses the Buffalo Man legend to conceal his true plot: to find a map that leads to the gold coins stolen in the Shield Mansion robbery. But Cavey and the Teen Angeles get one step ahead of Markham and both recover the loot and capture the conniving criminal.While investigating the hijacking of a delivery truck, Cavey and the Teen Angels recover the truck but discover that it's cargo of fortune cookies is missing. Piecing together the Chinese puzzle, the heroes discover that elderly and dignified Low Ling is using his Chinese laundry as a front for a counterfeiting ring, and that he is shipping the phony money out of Chinatown inside fortune cookies.

During a planned electrical blackout in New York, bank president Mr. Rhinestone and his accomplice, power station guard Mr. Crowley, steal the gold from every nation in the world. Cavey and the Teen Angels investigate the mysterious heist, recover the gold bars and put the culprits behind iron bars.While traveling on the riverboat Delta Princess, Captain Caveman and the Teen Angels are told the legend of a mysterious River Creature by the boat's skipper, Captain Moody. During the cruise, a heavily guarded, top-secret metal crate being transported upriver to the Nuclear Laboratory is stolen by the creepy River Creature. The Teen Angels set a trap and discover that Captain Moody, disguised as the River Creature, committed the theft.

Jacque LaForge's divers are about to raise a million dollars worth of gold and jewels from the sea bottom, but are frightened by a shark and lose the treasure. Captain Caveman and the Teen Angels cut short their vacation in Miami Beach. They rent a boat and scuba equipment and search the area where the treasure was lost. They discover that the mechanical shark was controlled remotely by two divers working for Jacque who planned to keep the treasure for themselves. Liz Devine, an aging star who has retired from Century Studios, becomes the dreaded "Phantom," prematurely aging beautiful young starlets by straying their faces with a wrinkle spay. The Teen Angels disguise Taffy as a beautiful, young starlet, and when the "Phantom" appears, Cavey springs into action and captures the scorned star.

Cavey and the Teen Angels drive to Central University to witness the unveiling of a new superstrong, superintelligent, three-and-a-half million dollar robot invented by Dr. Watts and Professor Price. During the unveiling, the robot--named Proto--vanishes. The heroes investigate the robot theft and discover that Professor Price, jealous of the attention that Dr. Watts has been receiving, reprogrammed Proto to appear as though he had vanished--when actually he was disguised but still on the stage.When famous hillbilly singer Jasper Joe Jeeter first loses his voice then disappears at the Hog Hollow County Fair, Captain Caveman and Teen Angels come to the rescue. They discover that Jeeter's jealous cousin, Cecil Skink, had hoped to replace Jasper Joe as a singing idol--and is behind his disappearance.