Santo vs. Evil Brain

A masked wrestler who also serves as an undercover police agent. He is brainwashed at Campos's lab but resists and fights back, maintaining his resolve to stop the villain. His physical prowess and inner struggle propel the action as he navigates loyalty and memory.

A respected scientist who abducts and brainwashes people, turning them into his crime-driving agents. He is charismatic and dangerous, motivated by control and his interest in Elisa. His secret passage and pursuit of a 'cell disintegrator' reveal his grandiose, unethical ambitions.

An undercover ally who uses a device to locate Campos's hideout and challenges Santo. He injects Santo with an antidote and urges him to pretend brainwashing, showing tactical cunning and willingness to risk himself for the mission.

Campos's secretary and Gerardo's girlfriend. She becomes a focal point for Campos's plans and is kidnapped as a key witness. Her relationship with Gerardo and the drama around kidnapping adds emotional stakes to the crime plot.

Campos's rival within the police, who investigates the brainwashing crimes and coordinates the raid on Campos's lab. He embodies professional duty and persistence against a dangerous conspiracy.

Elisa's boyfriend and Campos's assistant. He is drawn into the conspiracy but wakes from the drug-induced stupor and joins the effort to thwart Campos. His involvement adds a personal dimension to the stakes.

A gangster involved in the crime caper, one of Campos's henchmen. His role is tied to the bank robbery and the criminal network that Campos leverages.

Another criminal figure or henchman in Campos's network. He contributes to the danger surrounding the brainwashing scheme and bank heist.