[1] One of the founding members of the superhero group the Outsiders, he was created by Mike W. Barr and Jim Aparo, and first appeared in a special insert in The Brave and the Bold #200 (July 1983).

Jim submitted his visual ideas for those characters, with the exception of Geo-Force, who turned out to be the brother of Terra from The New Teen Titans.

She was still in the planning stages when I came up with the idea for Geo-Force, and Len said "Well, we have this other character with Earth powers in New Teen Titans, what are we going to do about that?"

[2] During this time, Brion meets Batman, Metamorpho, Black Lightning, Katana, and Halo, with which he forms the Outsiders.

[4] Following Terra's death during The Judas Contract storyline, Geo-Force assumes a new green and gold costume to distance himself from her.

In Millennium, the Outsiders disband after Helga Jace is revealed to be an ally of the Manhunters and is killed after attempting to attack Metamorpho.

Geo-Force's first attempt to talk to her meets with failure when he accidentally gets swept up in a rock column she has created during a loud party.

In Markovia, scientists conduct a DNA test in the hopes of discovering if Terra is Geo-Force's sister.

Geo-Force and Terra become kidnap victims of a strange cult run by a man with mind-control powers.

[5] Geo-Force briefly appears in 52 #35, assisting Metropolis citizens injured in a mass-murder caused by Lex Luthor.

He later is a part of the army of heroes gathered by the Justice Society at the end of 52 to battle Black Adam, who kills Terra.

While sailing in his yacht off the coast of Greece, Geo-Force suddenly finds himself losing control over his powers.

[volume & issue needed] Geo-Force seeks help from the newly reformed Justice League of America, becoming an unofficial member of the group.

While a prisoner, Geo-Force is brutally tortured alongside Red Tornado at the hands of Gorilla Grodd.

Geo-Force proclaims his affections for Katana, but before she can answer Geo's declaration of love, they are interrupted by Eradicator.

Eradicator pleads with Geo-Force to use his powers to subdue Geode, but Brion is conflicted over the idea of striking his wife.

With Geo-Force unable to take the initiative, Eradicator decides to unleash the full extent of his power to knock Geode unconscious.

[8][9] After the moon is shattered in Vandal Savage's battle with the Justice League, Geo-Force holds it together until the heroes can repair it.

He possesses superhuman physical abilities and can manipulate the Earth's gravitational field to increase or lower the weight of objects, generate lava blasts, fly at high speeds, and transform matter to stone.