Fibber has left it right until the last minute to register his license plates and is not looking forward to queueing round the block. Then Doc Gamble tells Fibber he's a member of the Auto Club and can get the license plates through them  for close relatives and avoid the queue. When Doc gets called to the hospital Fibber has to pretend to be the Doc getting the license renewal for his uncle Fibber McGee. When the Auto Club employee notices from the Doc's membership card that he's a MD Fibber finds himself giving out medical advice!