Synopsis
After being accused of murder a boxer makes himself invisible...
From the Back Cover
Abbot and Costello, recent detective school graduates are minding their new business when accused killer Tommy Nelson (Arthur Franz) bursts into their office. He proclaims his innocence, and persuades the lads to get him to his girlfriend. As the police arrive, Tommy injects himself with an invisibility serum. Nelson persuades Lou to go undercover as a boxer to help flush out the real killer. Costello, with Nelson's help goes into the ring as "Lou the Looper" for one of the most hilarious fight sequences ever filmed.