Version of the play "Todo bicho de uña". It tells the story of revenge. The tour of the Andean, for ten years, a young man in search of the rapist and murderer of his mother, takes us into the underworld strata fairs and circuses villagers.

A Mexican spoof about the DC heroes Batman & Robin. -Edgar Cochran-

Commissioner Leon (Miguel Angel Landa) investigates the murder of a woman in a population near the capital. The woman was raped before death and the case is complicated when his brother becomes the prime suspect, since it is a priest (Eduardo Serrano). Because of the implications that inquiries might have, Leon is pressured to keep the event as a "crab" (Cangrejo, or a unsolvable case), but he decides to comply with the law.