Thaddeus Sivana, Jr.

Thaddeus Sivana, Jr. is a male comic character who features in DC Comics.

Biography

Pre-Crisis

Thaddeus Sivana, Jr.

Sivana met with his children Sivana, Jr. and Georgia Sivana, saying that since they’d failed to take the Marvel Family down on their own they needed to team up as the Sivana Family. Sivana developed a machine to destroy the Marvels, but when he tried to test it by measuring the voltage of Shazam lightning the power surge broke the meter. Sivana knew he needed a power source greater than an atomic bomb to make his machine work. Sivana, Jr. Had uncovered manuscripts from ancient Atlantis about protium, an element even more powerful than plutonium. Protium was a radioactive element that turned into neutrium after 10,000 years and electrium after another 10,000. Sivana wanted samples of all three elements but knew they’d need to time travel. Fortunately for him he knew all the Marvel Family’s secrets and they could reach the future and the past from the Rock of Eternity. The Sivana Family flew their rocketships faster than the speed of light to reach the Rock, and Shazam alerted the Marvel Family. Mary Marvel followed Georgia Sivana to the Atlantis of 8,000 B.C. Chal-Patzun was the Atlantean professor who discovered protium and Georgia met up with him, learning that he’d correctly predicted Atlantis was about to sink,. Chal-Patzun showed her his machine powered by protium that he said could save Atlantis, and she hit him over the head with a stick. Mary Marvel arrived in time to restrain Georgia. Chal-Patzun explained that Atlantis was doomed, but after 20,000 years the protium in his machine would be changed into electrium which could be used to raise the city again and restore it to its’ former glory. Chal-Patzun had sent his son away from Atlantis with the secrets of how to operate the machine, and his son would pass that knowledge on to his children and his children’s children. Mary Marvel changed back into Mary Batson to see if her magic lightning could speed up the change of protium to electrium to no avail. The cataclysm hit Atlantis and the city sank, and Georgia managed to restrain Mary, steal a vial of protium and escape in her rocketship with Mary as her prisoner. In the present Sivana kidnapped Dr. Charles Patterson, the descendant of Chal-Patzun, and forced him to show Sivana were Atlantis was under the waves. Captain Marvel pursed him underwater, but Sivana used a giant electric eel to shock Marvel and turn him back into Billy Batson. Sivana took a vial of neutrium from Chal-Patzun’s machine, fatally shot Dr. Patterson and left with Billy as his prisoner. In the future of year 12000 Chass Passon, Chal-Patzun’s descendant, used the remaining electrium to finally raise Atlantis. Sivana, Jr. Clocked him with a wrench, but Captain Marvel, Jr. Ran him off. Marvel, Jr. Introduced himself to Passon, but by saying Captain Marvel he changed back into Freddy Freeman. Sivana, Jr. Knocked him out with a rock, took a vial of electrium and returned to the present with Freddy in tow. Sivana powered his machine, which created a cloud of free electrons around Earth, deflecting the Shazam lightning when the Marvels said their magic words. Sivana showed off his newly built palace, confident that without the Marvel Family to thwart him his family would assume their rightful role as rulers of the universe. The Sivana Family let the Marvels loose on the grounds to hunt them for sport, but Billy was wily enough to evade them and make his way to Sivana’s machine, depowering it. The Marvels said their magic words, wrecked the machine, and defeated the Sivanas. (Marvel Family v1 #10)

The mayor of Fawcett City threw a celebration at city hall to honor the Marvel Family, with a number of their friends and fans in attendance. The wicked Sivana Family chose that moment to strike from Sivana's spaceship, hitting the crowd with a vortex transporter paralyzer ray, drawing them into space, and encasing them in a globe of suspendium, a compound that would put them in suspended animation. Sivana, Junior slapped his dad on the back for a job well done, causing Sivana to lose control of his spaceship and crashing into the suspendium, trapping the villains with their victims. The globe orbited the sun for decades until the heat of the sun began to melt the suspendium, freeing the Marvel Family. They realized the suspendium was being pulled into the sun's orbit, and had to act fast to save the lives of everyone inside the globe. The Sivana Family revived and flew their spaceship to safety while the Marvel Family pushed the globe back to Earth before smashing it, freeing their friends and returning to Fawcett. Mary Marvel and Captain Marvel, Jr. went into space to search for the Sivanas, while Captain Marvel checked out one of Sivana's old mountain hideouts. He found the Sivana Family working on a death projector, which Sivana fired up, hoping it would destroy most of Earth's population, making him ruler of the world. Marvel smashed their machine and took the Sivanas to jail, but they all shared a laugh over how happy they were to be a live and out of suspended animation. (Shazam! v1 #1)

Billy Batson, Mary and Freddy attended Sterling Morris’ Christmas Eve party along with all of their friends. The Sivana Family groused in their lab about how much they hated Christmas, and Sivana activated his Cosmic Clock, speeding up time so Christmas day would only last 10 minutes. The Marvel Family went into action when they noticed time was speeding up around them, and they saved Santa Claus, who was having trouble controlling his sped up reindeer. Santa told them the Sivana Family were trying to ruin Christmas, so the Marvels flew to the Sivanas’ lab and made short work of them. Combining their strength the Marvels stopped the Cosmic clock and pushed its’ hands backwards so Christmas day could proceed at a normal rate. The Marvels visited the Sivanas in jail, and said they found an appropriate Christmas present, the first the Sivanas had ever gotten, for the family that proclaimed themselves the rightful rulers of the universe. The present turned out to be a book entitled The Universe, and the Marvels returned to Morris’ party to celebrate the holiday with their friends. (Shazam! v1 #11)

Post-Crisis

Following the Crisis on Infinite Earths, a new version of reality was created with a different history of events.

Overview

Personality and attributes

In appearance, Thaddeus Sivana Jr. was a young teenage male human with a smart yet hardened demeanor, bearing a slim build and sharp, calculating eyes that reflected both intelligence and entitlement. His face featured angular cheekbones, a narrow nose, and tightly pressed lips—an expression often tinged with disdain or condescension. His dark hair was neatly groomed and parted with precision, amplifying his scholarly, almost pompous air. A pair of round spectacles rested on his nose, and his posture was upright, exuding confidence and a sense of self-importance that seemed far beyond his years. He looked every bit the spoiled son of a genius—composed, severe, and cold. He did not wear a costume during his debut; instead, he appeared in civilian attire befitting a young scientist-in-training. He wore a crisp white lab coat draped over a tailored suit vest and slacks, each garment clean and well-fitted. His coat pockets held small scientific tools—vials and instruments—signaling his early involvement in his father’s work. Though lacking any flamboyance or armor, his outfit hinted at seriousness, intellect, and the weight of the Sivana legacy he carried. His absence of a mask or uniform reinforced that he perceived himself as operating on his own terms, unbound by the theatrics of costumed villains. (Captain Marvel Adventures v1 #52)

Thaddeus Jr.’s personality core, as showcased in his first appearance, was defined by sharp intellect, arrogant confidence, and unquestioned loyalty to his father’s megalomaniacal ambitions. He spoke with mature diction and calm resolve, even during tense confrontations, suggesting a precociousness that unnerved those around him. Despite his youth, he was not naïve—he fully understood the moral implications of their schemes and bore no shame in pursuing power through his father's directives. He expressed disdain for the Marvel Family, attempting to prove that the Sivana name and intellect were superior. While he lacked overtly violent tendencies at that stage, his demeanor was chillingly collected and strategic—an eerie echo of his father’s brilliance and ambition, not youthful impetuousness. (Captain Marvel Adventures v1 #52)

Sivana Jr. was born the son of Thaddeus Boddog Sivana who would take his child to join him in a life of crime. (Captain Marvel Adventures v1 #52)

Powers and abilities

Sivana Jr. was born an ordinary human being with no special powers or abilities. Much like his father though, he retained a keen intellect and was a gifted inventor and scienitst. (Captain Marvel Adventures v1 #52)

Notes

• Thaddeus Sivana, Jr. was created by Otto Binder and Pete Costanza where he made his first appearance in Captain Marvel Adventures v1 #52 (January, 1946).

Appearances

• Captain Marvel Adventures v1: (1946)
• Marvel Family v1:
• Shazam! v1:

External Links

• DC Database Entry

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