When their car veers off the road en route to their honeymoon, Joe Palooka and new wife Anne are rescued by a sweet lummox, Humphrey Pennyworth, who has amazing strength.
Knobby Walsh turns up, concerned about newspaper reports that Joe intends to retire from boxing.
Belden tells lies about Joe, persuading a gullible Humphrey to step into the ring.
Belden's thugs knock out Knobby, who has been running a scheme of his own, pretending to be Lord Cecil, a British boxing manager.
Joe is able to defeat him, Belden is arrested and Humphrey's sister Prunella brings him a pie.