Credited as the world's first android, Amazo was built by the deranged and immortal Professor Ivo. He sicced his creation on the Justice League in the hopes that their defeat would be a testament to his genius.

Originally built with the powers and skills of the original Justice League (Superman, Batman, Wonder Woman, Flash, Green Lantern Hal Jordan, Aquaman, Martian Manhunter) preinstalled, as well as a duplicate Lantern Power Ring and Lasso of Truth. As such he was a formidable adversary.

The powers and programming of Amazo has varied over time. Some incarnations of Amazo are pre-installed with the powers of members of the Justice League Of America (often Superman and Flash with the fighting skill of Wonder Woman). Other times the programming of Amazo varies. For instance the programming and absorption cell technology was implanted into the body of fellow android Red Tornado after the Red Tornado's soul moved on to a human body. This led to a conflict as part of the Red Tornado's spirit became ingrained in the android circuitry. On one occassion he was only able to duplicate the powers of the members in the Justice League, adapting as the roster grew (this Amazo was defeated when Superman disbanded the Justice League, leaving Amazo without any sources to copy). And in one example Amazo was able to steal the powers of the Justice League as well as their humanity, leaving the Justice League powerless androids. Amazo returned the League to normal when he couldn't reconcile his actions with his new emotions. These diverging programming and power fluctuations have not been officially reconciled within DC continuity.

Notably, Amazo has held a grudge with the Hourman of the 853rd century. When the temporal powered android traveled back in time and joined with the JSA, Amazo was jealous of how advanced in both technology and sentience Hourman was. They had a bitter feud until Hourman returned to his correct time line.

All incarnations of Amazo have the strength and invulnerability that comes with being an android. More recent incarnations of Amazo has the robot built with the ability to adapt and counter metahuman attacks through an internal database much like OMACs. In this manner Amazo can be considered to have the knowledge and planning of Batman. Unlike the OMACs Amazo can replicate powers to counter attacks instead of using pre-built defenses.

Recently, through poorly explained science, a boy was revealed to be Amazo's son KID AMAZO. Rather than join his father as a villan, Kid Amazo fought the urges programed into his genetic code and used his powers to stop his father.

This unpredictability is one of the threats of Amazo. It's always a gamble for any hero to encounter an Amazo as they can never be sure what powers the Amazo currently has.

The appearance of Amazo usually involves a pointy eared monster android with the ability to replicate the powers of nearby metahumans and a heartless or downright evil sentience.

A.M.A.Z.O

In the Justice League two part episode "Tabula Rasa", there was a project created by Professor Ivo called Project A.M.A.Z.O. With the fundings from Lex Luthor the purpose of the android was to have the Justice League destroyed. With Lex Luthor's sickness taking its toll on him due to him being around Kryptonite for so long he needed Amazo to help him in order to get the things necessary for him to survive. Lex persuaded the Android to help him and wanting to be more like his creator he shapes his face like Lex and he speaks for the first time. This version of the Android possessed nanotechnology which gave him the ability to copy the powers of the Justice League. He developed the weaknesses as well but eventually evolved into something which the vulnerabilities of the superheroes didn't affect him. After getting the Martian Manhunter abilities he was able to find out the real intentions of Lex. Lex knowing that the Android figured out what he had been up to attempted to destroy the robot with the eternal time bomb which he could have set off any minute with the press of a button did so. Thinking that he was gone Lex had his little moment until the Android assembled itself and destroyed the power suit that Lex had worked so hard to build. After realizing the pettiness of how humans can be the Android leaves Earth in search for more. Wondering the universe he turns gold scanning space.

The Justice League Unlimited

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In the episode "The Return" the Android return back to Earth to search for Lex Luthor. On Amazo's way back, the planet Oa was in his way and despite the attempts of the Green Lantern Corps to try and stop the android, the planet and its entire population was apparently destroyed. SO in order to defend Earth and Luthor, the League calls almost every hero try try and stop him. The plan was to have three fron line in which to fight the Android. The first was in space, the second was in the skies above Earth, and the final one was near Luthor's hideout. The first line had Superman, Green Lantern John Stewart, Orion, Captain Atom, Doctor Light, Stripe, and the League's entire fleet of Javelin spacecraft. The Second line consisted of Supergirl, Rocket Red, Fire, and Red Tornado, and Fire. Upon Lex's hideout was guarded by Wonder Woman, Flash, Steel, and Ice. All of these attempts of stopping the Android had failed. When finally getting to Lex the Android asked Lex what was his purpose. At first Lex was scared of the Android but then had told him that he actually felt sorry for him. Luthor tells the Android that it must forge its own destiny. Surrounded by the last member of the Green Lanterns Corps, they were going to kill the Android by combining the power from their rings until Doctor Fate offers to help the Android find its destiny. The Android tell John that he made it disappear because it was in his way and he returns it back to where it was before. Amazo moves into Doctor Fate's tower.

The Return

Amazo appears in the episode "Wake the Dead" where he tries to help the League with the return of Solomon Grundy. After touching him he realizes that Grundy was absorbing his powers had left light years away from Earth because he knows that him being there would be a threat since Grundy was made by "chaos magic". This was the last they had ever saw him.