
Morlocks are a group of mutant characters appearing in American comic books published by Marvel Comics. The characters are usually depicted as being associated with the X-Men in the Marvel Universe. Created by writer Chris Claremont and artist Paul Smith, they were named after the subterranean race of the same name in H. G. Wells' novel The Time Machine - but unlike in the Wells book, they are not a faceless, threatening mass of villains. They first appeared as a group in The Uncanny X-Men #169. Caliban appeared prior to that, but he was not yet a member of the Morlocks.

Apocalypse is a fictional supervillain appearing in comic books published by Marvel Comics. He is one of the world's first mutants, and was originally a principal villain for the original X-Factor team and now for the X-Men and related spinoff teams. Created by writer Louise Simonson and artist Jackson Guice, Apocalypse first appeared in X-Factor #5. Apocalypse is one of the most powerful beings in the Marvel universe.

Bird-Brain is a fictional character appearing in American comic books published by Marvel Comics.

Cable is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with X-Force and the X-Men. The character first appeared as a newborn infant in Uncanny X-Men #201 created by writer Chris Claremont, while Cable's adult identity was created by writer Louise Simonson and artist/co-writer Rob Liefeld, and first appeared in The New Mutants #87.

Dazzler is a fictional superheroine appearing in American comic books published by Marvel Comics, usually associated with the X-Men. She first appeared in Uncanny X-Men #130.

Erg is a fictional mutant character appearing in American comic books published by Marvel Comics.

Steel is a fictional superhero who appeares in comic books published by DC Comics. He is a genius engineer who built a mechanized suit of armor that replicates Superman's powers and bears Superman's logo. Initially, he sought to replace Superman after Superman was killed by Doomsday. After Superman was resurrected, Superman accepted Steel as a comrade. His real name is John Henry Irons and he wields a sledgehammer—this is a reference to the mythical railroad worker John Henry. He has a niece named Natasha Irons who is also a superhero in a similar mechanized suit of armor.

Natasha Irons is a fictional superhero in DC Comics. She first appeared in Steel #1. She becomes the fifth superhero to use the name Steel when her uncle John Henry Irons is injured. In the 2006 limited series 52, Natasha gains superpowers and uses the codename Starlight. When her powers change, allowing her to become a being of living mist she assumes the codename Vaporlock.

N'astirh is a fictional character appearing in American comic books published by Marvel Comics. The character was created as a demonic inhabitant of Otherplace.
Julie Power is a fictional character appearing in American comic books published by Marvel Comics. She first appeared in Power Pack #1 and was created by Louise Simonson and June Brigman.

Kate Margaret Power, is a fictional character appearing in American comic books published by Marvel Comics. She first appeared in Power Pack #1 and was created by Louise Simonson and June Brigman.

Rictor is a fictional superhero appearing in American comic books published by Marvel Comics, primarily in the X-Men family of books. The character was created by writer Louise Simonson and artist Walt Simonson and first appeared in X-Factor #17. In subsequent years, the character was featured as a member of the original New Mutants team and the original X-Force team, and continued to appear in various X-Men franchise publications thereafter. In comic books published in the 1980s and 1990s, Rictor's mutant powers were to generate and manipulate seismic energy and creating tremendously powerful vibrations in any nearby object, inducing earthquake-like phenomena and causing objects to shatter or crumble. When the character was reintroduced in 2005, it was as one of many depowered mutants adjusting to civilian life. The character remained depowered until a 2011 comic.

Skids is a fictional mutant character appearing in American comic books published by Marvel Comics.

Alistair Alphonso Smythe is a fictional supervillain appearing in American comic books published by Marvel Comics. The character is usually depicted as an enemy of the superhero Spider-Man, and the son of Spencer Smythe. After his father dedicated his life to eliminating Spider-Man and died as a result, Alistair inherited his Spider-Slayer legacy and developed a hatred for the web-slinger. He turned to a life of crime to exact revenge on Spider-Man, and created a new generation of Spider-Slayers to kill him, but this only resulted in Alistair getting paralyzed from the waist down. Later, he encased his body in a bioorganic carapace that allowed him to walk again, in addition to giving him superpowers, and adopted the alias of the Ultimate Spider-Slayer.

Stryfe is a fictional supervillain appearing in American comic books published by Marvel Comics, most commonly in association with the superhero team X-Force. He is a clone of Cable.
Tempo is a fictional African-American mutant character appearing in American comic books published by Marvel Comics. She was first introduced as a member of the Mutant Liberation Front in New Mutants #86.

Power Pack is a fictional team of superheroes consisting of four young siblings appearing in American comic books published by Marvel Comics. Created by writer Louise Simonson and artist June Brigman, they first appeared in their own series in 1984, which lasted 62 issues, and have since appeared in other books.