TripleMania XXXI: Tijuana was a professional wrestling event produced by Asistencia Asesoría y Administración (AAA). The event took place on July 15, 2023 in Estadio Caliente in Tijuana, Baja California.

Calpuina is a night-watchman in a wharehouse, a perfect job for him. When some thieves break in and steal some crates, El Santo is after them because they are using the wharehouse for diamond smuggling. Capulina hinders their capture. Then he decides that he will put on a wrestler's mask and help El Santo to caputre the crooks.

Santo and Jorge Rivero team-up to stop an international syndicate from stealing Mexico's greatest treasure.

The silver masked Santo tries to stop a gang of counterfeiters who conspire to ruin the economy.

Santo, the saint of the wrestling ring, faces off against an evil voodoo priestess intent on making a more powerful atomic bomb!

The Blue Demon faces a murderous satanic hypnotist.

Dr. Frankenstein and her assistant, Dr. Yanco, are going to bring one of their experiments to life in Santo Vs. Frankenstein's Daughter. She intends to use a monster named Ursus to do her evil bidding. Using a youth serum to retain their vitality, the doctors set their sights upon none other than El Santo. They need his super human blood to regenerate a stronger youth serum. They kidnap Santo's goddaughter, Norma and lure him into Dr. Frankenstein's lab where he is captured and enslaved. Will Santo make it out alive?

Innocent women are being kidnapped and used as guinea pigs for a brain transplant experiment. The diabolical Dr. Frankenstein continues his quest to perfect his brain transplant operation to bring back his deceased wife at any cost - even if it means playing with the lives of others. El Santo and Blue Demon are called in to help when their friend Alicia becomes Dr. Frankenstein's next target. It'll take both heroes to go up against the dastardly doctor and go mano a mano with his super strong zombie Golem.

Cowboy sheriff investigates the murder of a crooked lucha-libre promoter.

The Panther women are worshipers of Satan and perform rituals in their honor and sacrifice. The fighters will face them up and down the ring.

A lady wrestler and her boyfriend, a policeman, battle a mad scientist who has developed a murderous killer robot and uses it to kidnap wealthy people.

Intimate problems and the wickedness of friends is resolved in the ring.