Amadeus Cho

There was also a Golden Age character called Mastermind Excello, a genius with psychic powers.
 
Cho is extremely intelligent. He can use his brain to perform complex calculations almost instantly. This give him the ability to take on foes and challenges with very little effort.

World War Hulk

When the Hulk and his Warbound attacked Earth, everyone tried to stop him. Cho's plan was different, and he formed a group of Renegades consisting of Cho, Hercules, Angel and Namora to help the Hulk. The Hulk and the Renegades even fought against Thunderbolt Ross and the army. He tried to offer help to the Hulk even saying they should use Angel's money to pay for a safe place; but the Hulk, determined to get revenge, ignored Amadeus’s advice. Amadeus does not give up feeling Hulk is not a monster like most people believe him to be. However, despite his trust in the Hulk, Cho works with Scorpion and S.H.I.E.L.D. in an attempt to free his prisoners. After being poisoned, by Scorpion, Cho and the Renegades fight Hulk to increase his anger so he will heal but no matter what Cho does and no matter how angry he gets him he never hurts him increasing Cho's trust. The Renegades continue to aid Hulk, even when he fights against Doctor Strange possessed by Zom. It was actually Cho who allowed Zom to enter his body and be knocked unconscious, but in the end Hulk was defeated and the Renegades disbanded. However Hercules and Cho remained together.

On the road

Cho and Hercules are now partners of sorts, and have spent their summer destroying S.H.I.E.L.D.. They are guided by Athena, who tells them to stick together and hopes Cho won't become evil. When Cho's puppy got hurt, he unleashed a virus taking down basically everything S.H.I.E.L.D. had under its control, thanks to help from a drugged Hercules who had been shot by Ares with bullets covered with the blood of the Hydra. Cho stopped the virus after Hercules pleaded with them, and S.H.I.E.L.D. blew their craft up, but luckily they escaped via teleporting.

During the Secret Invasion; Hercules and Cho, like many heroes, do what they can to fight against the Skrulls. Athena tells them that if they are able to kill the Gods of the Skrull they may have a chance of bringing them down. To do this, Hercules and Cho form a "God Squad” who set off to bring down the skrull gods. During their assault they are attacked by Nightmare and freed from his powers by Kirby (who is later eaten by Atum after discovering the dog to be a skrull). The God Squad fight Kly'Bn and his wife Sl'Gur’t. They lose Atum; but kill the two gods, winning a blow for earth.

After trying to relax with Namora, Cho is taken by amazons who want him to translate an ancient item they want to use to change the world literally.

Mighty Avengers

Cho, along with Hercules, met up with long time Avengers ally Jarvis. Meanwhile, the world was being attacked by a series of strange magical attacks called Chaos cascades. Scarlet Witch used her powers to take them to see Wasp. Cho and Wasp debate for a while on how to best handle the problems and during their talks, Pym downgrades Cho to the 8th smartest person. Scarlet Witch uses her powers once again and takes the group in the middle of danger summoning even more heroes.
 
Powers
 
Amadeus Cho's brain operates like a hypercomputer performing an infinite number of simultaneous calculations. This allows him to identify the variables and quantum possibilities in any situation, and use this information to adjust the outcome so it is favorable to him. However his brain operates on sugar so he requires candy and junk food to do this.