When a bumbling New Yorker is dumped by his activist girlfriend, he travels to a tiny Latin American nation and becomes involved in its latest rebellion.

Jobless sportswriter Eddie Willis is hired by corrupt fight promoter Nick Benko to promote his current protégé, an unknown Argentinian boxer named Toro Moreno. Although Moreno is a hulking giant, his chances for success are hampered by a powder-puff punch and a glass jaw. Exploiting Willis' reputation for integrity and standing in the boxing community, Benko arranges a series of fixed fights that propel the unsophisticated Moreno to #1 contender for the championship. The reigning champ, the sadistic Buddy Brannen, harbors resentment at the publicity Toro has been receiving and vows to viciously punish him in the ring. Eddie must now decide whether or not to tell the naive Toro the truth.

Mario "Cantinflas" Moreno is a hired hand, Pepe, employed on a ranch. A boozing Hollywood director buys a white stallion that belongs to Pepe's boss. Pepe, determined to get the horse back (as he considers it his family), decides to take off to Hollywood. There he meets film stars including Jimmy Durante, Frank Sinatra, Zsa Zsa Gabór, Bing Crosby, Maurice Chevalier and Jack Lemmon in drag as Daphne from Some Like It Hot. He is also surprised by things that were new in America at the time, such as automatic swinging doors. When he finally reaches the man who bought the horse, he is led to believe there is no hope of getting it back. However, the last scene shows both him and the stallion back at the ranch with several foals.