As nobody else has reviewed this, I'll take a stab, although having seen it without subtitles I may have missed the fine points of plot...which admittedly did not appear to be very fine at all. Cuban bodybuilder Sergio Oliva, who won Mr. Olympia three times (until he was nudged out by young Arnold S.), plays a dockworker whose extraordinary strength attracts attention from some bad guys when he singlehandedly lifts a heavy object fallen from a crane off an injured coworker. This leads to him being variously attacked, jailed, framed, blackmailed, coerced into luchador wrestling, hospitalized, vamped by a blonde bombshell (in offended response he throws her off a boat), and so forth. On the good-guy side, there are other wrestlers (including Mil Mascaras and El Teque) who come to his defense, and a nightclub singer he does spark with romantically, who is eventually kidnapped as part of the plot against him. Inevitably, the climax is a good guys versus bad guys fight in a warehouse.
This is your basic 1970s B-grade action movie in which the peaceable-until-wronged hero has to survive a series of trials before finally turning the tables on the corrupt baddies. It's undistinguished by anything beyond Olivia's incredible physique, which of course is much on display. As an actor, he's a pleasant enough presence, but isn't exactly given a lot to work with. While the film may otherwise be forgettable, the supporting cast plays its one-dimensional roles colorfully. And the pace is lively. The whole thing is handled with professional efficiency if no great inspiration or style by its extremely prolific Mexican director. So...nothing special, but fun.
