[No.] 26 [Title] "The Dummy" [Original airdate] 15 March 1980 [Synopsis] 
When some jewels are stolen, a ventriloquist whom Captain Caveman and the Teen Angels had been watching the night before is immediately suspected by a policeman. Captain Caveman and the Teen Angels conduct their own independent investigation which takes them to Hoover Dam where the ventriloquist and his accomplice are boating to skip the country. When the jewel thieves are caught, it turns out that the ventriloquist was the dummy, and the dummy was the ventriloquist.