Santo vs. the Martian Invasion aka Santo contra la invasión de los marcianos sees martians, led by Argos, arrive on Earth determined to enforce nuclear disarmament. Their first appearance on TV is not taken seriously – so they decide to scare the earthlings into compliance. This takes the form of landing in Mexico, disintegrating a fair number of innocent bystanders – including numerous women and children. They also kidnap a handful of people to take back to Mars.
The martians though did not count on one thing: El Santo! (along with his scientist friend, Ordorica).
At the end, Santo steals a transporter belt from a Martian and follows them back to their ship. He opens the hatch, allowing “poisonous” Earth air into the vessel, frees the hostages, and blows up the Martians.