The Indigo Tribe wield staff lanterns powered by the Indigo Light of Compassion.

Group of mutated villians led by Brainard who fought Stryke Force.

A parody superhero group.

The X-Gene Positive babies who were used by the government to open up a portal to Limbo. Due to time dilution the babies are now full-grown and have been indoctrinated to believe the X-Men are their enemies.

The Infinite Empire, also called the Builders, was the first known major galactic government. Founded and ruled by the Rakata, a scientifically advanced species that used their knowledge to conquer and enslave other species.

The foot soldiers of Apocalypse of Earth-295.

Mysterious corporation who can move their entire building from place to place and is looking into a mysterious temporal death of Supermen

Infinity, Inc. was a group of teens comprised mostly of children or heirs to JSA. The second group with the title were granted powers and outfitted with names of former members by Lex Luthor to serve his purposes.

The Infinity Watch is a team assembled by Adam Warlock to safeguard the six Infinity Gems.

The Inheritors are a family of Totem Eating beings that sustain themselves by feeding on the life-force of heroes and villains bearing a Totem connection. Most notably Spider-Totems.

A team of Golden Age superhero sidekicks, led by Boy King.

The trio of villains of the short-lived Hasbro toyline "The Inhumanoids" that spawned a cartoon and comic book series.

The result of Kree experimentation on Homo Neanderthalensis using Terrigen Mist, The Inhumans are a race of super powered beings who live in isolation and do not trust humans.

The instructors at the base and training facility of the entire Initiative. Some members of staff are reformed villains, and some are heroes.

The Injustice Gang formed by Lex Luthor and six other of the world's most deadliest super-villains bent on destroying the JLA and dominating the world!

Team of Multiversal villains aimed at stopping crossovers between the worlds.

The Injustice League assembled to oppose the JLA, having taken various forms that consist of major villains like Joker, Lex Luthor and Cheetah.

Reborn Parasite Spawns of the Injustice League in the 30th century.

With Hecate taken out, Circe found herself more powerful than ever, so she put a team together to stand in the way of Wonder Woman's Justice League Dark.

The Injustice Society is a group of villains who primarily oppose the JSA.

Injustice, Unlimited was the evil counterpart of Infinity, Inc. The group consisted of the members of the Injustice Society as well as some of their children.

Creatures that emerged from Dorothy Spinner's unconscious.

Selene's handpicked mutants specialized for their ability and desire to kill. Inner Circle was tasked to help Selene to become a goddess of death.

A team of robots, serving Madame Masque.

Innocents of God are Jeremiah's cult.

Inquisition were sadomasochistic fanatics who believe near constant personal torture is necessary to "extract" deep philosophical truths abont the universe.

An insectoid is any creature that shares a similar body or traits with common insects.

Limbo demons designed like The Sinister Six to torture Spider-Man

A group of Squadron Supreme's most dangerous enemies brought together by the Scarlet Centurion originally as part of a contest with the Grandmaster.

Strongly against Superman's creation of the One-Earth Regime, Batman summons as many heroes he can find who have yet to side with Superman's dictatorship in order to combat it from the shadows.

Group consisting of the Earth's most evil geniuses in the Marvel Universe.

A fictional U.S. government intelligence agency aka IADC.

Cosmic team of officers of different police corps who work together to prevent interdimensional breachings.

International superhero group, under the leadership of Redstar.

A criminal cabal of the DC universe. Superman met up with some of the members.

An armada of survivors of planets Galactus has destroyed

Two Millennia ago, time displaced Wakandan explorers settled on a habitable planet. Eventually, they expanded out to five galaxies, building an empire through conquest and slavery.

Intergang is an organized crime syndicate. They have managed to stay one step ahead of most Earth-based crime fighters by using technology from Apokolips.

A team appearing in DC's Lobo #1000000

International humanitarian movement.

The International Sneaky Service is a spy organization.

A team of government-sponsored heroes turned independent global peacekeeping force.