Costumed guests of the Time in A Bottle pub in London. They have a good and an evil faction.

Yondu and the Ravagers are space pirates

A group of teen metahumans that escaped from N.O.W.H.E.R.E., an organization that wanted to use them as weapons. A second group known as the Ravagers are Harvests Metahuman selected from the survivors of the various cullings beginning with Shadow Walker.

Four Magical Elemental Beasts

Creatures inhabiting the Desert of Dead Skin.

A black ops outfit that runs Operation Prodigy.

The Resources Control Executive is a British Intelligence Agency, founded to replace S.T.R.I.K.E.

Controlled by the Walker Family, Reality Incoporated is an overpowerful company expediting the over-exploitation and ransacking of alternate realities for their resources, from minerals to populations.

Are skeletons that are undead. Usually they are in armies or sometimes alone.

The Reanimen are the cybernetic creations of the mad scientist, D.A. Sinclair. After being defeated by Invincible, Sinclair and his Reanimen were recruited by Cecil Stedman for the Global Defense Agency.

The Reapers are a group of clones of the High who were bred as living warheads as part of the Number of the Beast program.

The Reavers are a group of cyborgs that are most known for their criminal activity, and their hatred of mutants including the X-Men.

Military fleet from Arcturus IV

The Rebel Alliance, also known as the ''Rebellion'' or ''Rebels'', are a team of those opposing the evil Galactic Empire.

After Lyrl Dox, Vril Dox's son, usurped his father's control over L.E.G.I.O.N., Vril and everyone still loyal to him created the R.E.B.E.L.S., Revolutionary Elite Brigade to Eradicate L.E.G.I.O.N. Supremacy.

These are the individuals have received one of Agent Graves Attachés complete with information about the person who ruined their lives, a gun, 100 bullets and the immunity to do justice themselves. While some succeeded in this task, others failed...failure equaling death.

The R.E.C.R.U.I.T.S. are the trainee division of L.E.G.I.O.N.

A kind of gorillas from the Lava Hills of Khitai

Redblood is the Russian counterpart of Younblood led by ex-KGB leader General Alexander Strokia.

Pirates of the Vilayet Sea.

The Redcaps come from the faerie realm. They are short, wear red caps, often appear naked under overcoats, and use dangerous slings as weapons.

Cybernetically enhanced black market arms dealers

Lead by a "Company" agent named, Aleister Ravenna, the Red Dragon are a group that are trying to control the world via mind-control.

The Redeemers were a group gathered by Nighthawk, to oppose the Squadron Supreme's Utopia Program, the team included former Squadron and Institute Of Evil members along with some others.

The Redeemers were a team of superhuman criminals seeking amnesty for their crimes. They were operatives of the V-Battalion.

A team of ex-mercenaries in the future of Earth-7484, trying to undo the wrongs they did and free America from the despotic designs of Hellinger.

Originally organized by the Redeemer to take down the Sinister Spiderman (Venom)

The Red Guard is an elite team of SHIELD agents in the House of M universe, created when the Scarlet Witch re-built reality to fit her desires. Wolverine is their leader, but when he apparently goes rogue, the rest of the team is forced to hunt him down.

A group of criminals located in Philadelphia.

A gang of Gotham criminals who rotate men under the guise of their leader in order to help protect the identity of the gang's true leaders if a job goes wrong. The most notable "leader" of the Red Hood Gang was the man who became the Joker.

Powered by the red light of rage, Atrocitus and his Red Lanterns travel the universe enacting violent retribution against injustice wherever they find it.

One of the races of Barsoom.

The Red Right Hand are a collection of non-powered humans dedicated to destroying Wolverine. The members share a history with him in that he at some point in each of their lives victimized them and/or a loved one causing them to hold a lifelong vendetta.

The Red Room, also known as the Black Widow Program, is a top-secret Soviet brainwashing and training program. The program takes young women and turns them into the world's deadliest and most elite assassins.

The Red Shadows is the Russian equivalent of the Suicide Squad, led by Major Zastrow.

The Red Shadows are the enemy to the Action Force. The Red Shadows have recently been revived as an additional enemy to G. I. Joe.

A Neo-Nazi militia that mixes iconography of both Johann Schmidt and Frank Castle.

The Red Slayers are an elite fighting force in the Valusian army, serving as both King Kull's cavalry, and as his personal bodyguard at the palace.

Former circus group led by Oswald Cobblepot.

Trio of Golden Age patriotic soldiers.