Cameo Appearances (heroes and Villains)
- War Machine (James Rhodes), Sunfire, and Spider-Man were shown saving people from falling rubble in the "Phoenix Saga."
- Domino (Neena Thurman) (voiced by Jennifer Dale), Feral (Maria Callasantos), Gargoyle I (Yuri Topolov), Rictor (Julio "Ric" Richter), and Warpath (James Proudstar) were seen as slaves on Slave Island. Domino also had a cameo appearance in the episode "Repo Man."
- Kangaroo (Frank Oliver), Random (Marshall Stone III), Arclight (Philippa Sontag), Blockbuster (Michael Baer), Tarbaby, and Black Panther (T'Challa) had a cameo appearance in the two-part episode "Sanctuary."
- Ghost Rider appeared briefly as a memory in one of Gambit's flashbacks in the episode "Final Decision."
- Deadpool (Wade Wilson) - Morph briefly transforms into Deadpool. Deadpool's face is also seen in a flashback while Professor X is probing the mind of Sabretooth. In the "Phoenix Saga," an evil psychic projection of Xavier also created an illusion of Deadpool while tormenting Wolverine.
- Moondragon (Heather Douglas), Stryfe, and Typhoid Mary (Mary Walker) had a cameo in the episode "Beyond Good and Evil (part 4)."
- Immortus (Kang the Conqueror/Nathaniel Richards) had a cameo after he was revealed as the true identity of Bender, the Axis of Time custodian.
- Gatecrasher had a cameo appearance in the episode "Proteus (part 1)."
- Eternity, Doctor Strange, Captain Britain (Brian Braddock), Spider-Man Uatu, and Thor had a cameo appearance in the "Dark Phoenix Saga."
- Nick Fury, G. W. Bridge, and War Machine are seen in the episode "Time Fugitives (part 1)" aboard the S.H.I.E.L.D. Helicarrier watching a U.S. Senate committee hearing on mutants being blamed for infecting non-mutants with a "mutant plague" (genetically engineered by Apocalypse masquerading as a member of the Friends of Humanity). War Machine is also briefly seen earlier in this episode in the year 3999 AD, fighting against Cable and his allies.
- Elektra
- Hulk (Bruce Banner) made a cameo as one of Xavier's robots in "The Juggernaut Returns."
- The Punisher (Frank Castle) is shown on a video game cover in the episode "Days of Future Past (part 1)" and as a robot in the episode "Mojovision."
- Senyaka, Forearm (Michael McCain), Reaper (Pantu Hurageb), Strobe, Ape, Mole, Slither, and Copycat (Vanessa Carlysle) appear as background extras in the episode "Secrets, Not Long Buried."
- Tusk, Feral, Toad, Reaper, Kangaroo I, Blockbuster, Arclight, Callisto, Forearm, Mole, and Sunfire made a cameo appearance during the episode "Graduation Day" amongst the mutant army Magneto assembles.
- Daredevil (Matt Murdock) can be seen as a dartboard in the episode "No Mutant Is an Island."
- Howard the Duck can be seen on Beast's T-shirt in one episode.
- Technet appear in a pub in Scotland in "Proteus (part 1)."
- Super-Skrull is briefly seen among the audience in the stadium in the episode "Mojovision"
Read more about this topic: List Of X-Men (TV Series) Characters
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“Truth has scarce done so much good in the world as the false appearances of it have done hurt.”
—François, Duc De La Rochefoucauld (16131680)