In the Ultimate universe, Mr. Fantastic is 20 years younger than his mainstream counterpart and is the leader of The Fantastic Four. He is also insane.
Unlike his 616 counter part, he is born in a normal family but with extremely gifted intellect at his early ages. He have shown to teleport objects into N-zone before any scientist on Earth could.
The accident involving a N-zone experiment replaced Reed's cells to a single cell which could duplicate most human body's function, which allow him to stretch any part of his body, he also could stretch his brain to further improve his intelligence and ability to muti-task.
Reed Richards of the ultimate universe was created by Mark Miller and Brain Hitch and first appeared in Ultimate Fantastic Four issue 1 (2004), based on the character created by Stan Lee and Jack Kirby. He first appeared as The Maker in Ultimate Fallout issue 4 (2011)
Major Story Arcs
Following the events of Ultimatum, the Fantastic Four disbanded. Similarly, Sue and Reed ended their relationship. Reed ends up moving back in with his parents.
Ultimate Doom Trilogy
Reed Richards, ex-leader of the world famous Fantastic Four, now lives with his parents and his father is not happy about that especially since he has no job to contribute to the family. After being brutally woken up by his father, Reed's computer detects an energy flux, and then somebody's at the door. Even though Reed warns his father not to open the door, he opens it, and a purple, cloud-like explosion happens inside the Richard's home.
As Reed appeared to have died during the explosion at his home, the remaining Fantastic Four mourn his death. However, it is revealed that Reed did not perish in the explosion. In fact, he is responsible for the explosion as well as the rest of the attacks at Roxxon, the Baxter Building, etc. Reed's plot is discovered by Sue Storm, who confronts him. Sue is quickly beaten by Reed.
Reed is now convinced that he has figured out how the world should be and is willing to do what he thinks is right, regardless of the consequences. Reed is currently planning to implement his intended changes, and a team consisting of Sue and Johnny Storm, Ben Grimm, Spider-man, Spider-woman, Carol Danvers, Nick Fury, and Captain Mar-Vell intend to stop him. When they find him, they don't give him the chance to explain himself. Johnny burns him with a fire blast that burns the right side side of his face, and made his right arm stop working. When the heroes destroyed his lab, Reed was flung into the Negative Zone.
Ultimate Comics: The Ultimates
Reed has since made his way back from the Negative Zone, and taken over most of the European Union, with the help of his latest creation, "The Children." There they set up shop in what is known as "The Dome." As a defense Reed sent a warhead to Washington destroying it along with most of the U.S Government and President. He was ultimately defeated and captured.
Reed later escaped from captivity and formed the Dark Ultimates, a group consisting of himself, the Hulk, Quicksilver, and Kang the Conqueror. Using the Infinity Gems, the group formed the Infinity Gauntlets and used their power to defeat the Ultimates and conquer the planet in order to prove they could do a better job saving the world. They ended up being defeated after the gems were shattered, and Reed was once again imprisoned.
During the Cataclysm crisis, Reed returned and partnered with Miles Morales to travel to Earth-616 to find info about Galactus. While there, he met Valeria Richards and learned that in this reality, he was still a respected hero and had married Sue. This revelation seemed to bring out the good in Reed, and he helped the Ultimates trap Galactus in the N-Zone.
With his reputation restored, Reed partnered with Nick Fury to revamp the Ultimates Initiative and protect the world more efficiently. This proved to be a ruse, as Reed had only feigned a return to the light so that he could continue his own shadowy plans. During a trip across dimensions, he encountered Thanos and the Cabal of Earth-616.
Richards, still under the guise of The Maker, learns of the incursions that are incoming and begins to manipulate The Ultimates into prematurely attacking Earth-616, in the hopes that he can use it to his advantage. He is still working with Earth-616's Cabal at this point, and Thanos points out that "There is no saving anything. No victory to be had. No victory of any kind. So why lie to them?" Richards proceeds with his plan and deploys his "doomsday weapon." This attempt to defeat Earth-616 is futile though, and Richards is powerless to stop the incursion from destroying both universes.
Richards and The Cabal are only able to escape by using a raft designed for the exact circumstances of the incursions completion. Years after Battleworld is created, The Cabal emerge, taking note of the strange readings the planet they appeared on was producing.