The series follows the mystery-solving adventures of the Teen Angels—Brenda, Dee Dee and Taffy—and their friend Captain Caveman (or Cavey for short), a prehistoric caveman and superhero whom the girls discovered and thawed from a block of ice. The concept and general plot for the show was seen as a parody of "Charlie's Angels".

Sadie Martin owns a riverboat that is frequently used by miners traveling to their claims. During their trip, the miners drink and gamble. Sadie's daughter, Helen, is unaware of her mother's work because her mother sends her to boarding school in order to live a lifestyle more attributed to the upper-class. Unfortunately for Sadie, she is facing difficulty maintaining the costly riverboat. She is soon forced to sell the boat in order to make ends meet.