Retro Rockets returns for the Sonic Summerstock 16th season finale with a great cross-over episode from the Old Time Radio series "I was a Communist for the F.B.I." and Retro Rockets. From the far distant pulp future Jeffrey Billard, Mel Rose, Lothar Tuppan, and John Bell bring you- "I was a Martian for the E.B.I." and "Sleeper"