A wealthy patron of the arts decides to find a deserving youngster who will appreciate his Stradivarius violin by holding a music contest in Vocalian Hall. Unfortunately, a group of crooks decide that the violin could line their pockets with much needed cash, so they kidnap, then disguise, a young violinst, to win it for them, and it's up to the Terror Twins to stop them.; Two fellows come into a store where Bob and Tim are and make a recording.....not knowing that the last part of that record reveals the true identities of the Terror Twins!; Bob relates a story to the Fibber's Club involving the Terror Twins, who are taken by a noted nuclear physics scientist thousands of years into the future with his time machine. Bob wins a trophy that he can keep for 50 years for telling the best fib, and he has a surprise for them to mull over: a talking mechanical Black Terror doll from the future that can answer their questions!; Professor Randall takes his criminology class up to the State Prison to watch the inmates play a baseball game, and end up getting involved in a planned prison break.