The Juggernaut Returns - S3-E17
Trivia: When the new Juggernaut crashes through the film studio, the production being filmed is a parody of Mighty Morphin' Power Rangers. There is even a short musical phrase similar to MMPR's theme song. (00:16:10)
The Dark Phoenix (2): The Inner Circle - S3-E12
Trivia: The main antagonists in this episode as well as the episode that follows it are the Inner Circle. In the comics, the Inner Circle are a sort of clandestine group of mutants that operate within an elitist social group known as the Hellfire Club. Due to censorship reasons, the Hellfire Club aspect of the group is not acknowledged. Its members are visually based on famous actors. Sebastian Shaw is based on Robert Shaw, Harry Leland is based on Orson Welles, Donald Pierce is based on Donald Sutherland, and Mastermind in his Jason Wyngarde persona is based on Peter Wyngarde. The White Queen/Emma Frost is based on the character Emma Peel from the British television series "The Avengers."
Trivia: The Spirit Drinker is based on the Monster from the Id from the 1956 film Forbidden Planet.
Weapon X, Lies, and Video Tape - S3-E19
Trivia: During Wolverine and Sabretooth's first joint flashback, they are shown stealing a device from Omega Red labeled "C-Synt." This is short for Carbonadium Synthesizer, which in the comics is capable of damaging Wolverine's healing factor as well as protecting Omega Red from his own "death factor." (00:08:00)
Weapon X, Lies, and Video Tape - S3-E19
Trivia: The title for this episode is a reference to the film "Sex, Lies, and Videotape."
The Juggernaut Returns - S3-E17
Trivia: During the flashback when young Xavier is reading young Cain's mind, a Captain America figurine can be seen on Cain's shelf. (00:16:45)
Trivia: The shot of the newspaper that Lorna shows to Iceman shows that the newspaper is the Daily Bugle, which is the place of employment for Peter Parker a.k.a. Spider-Man. The editorial on the front page is said to be written by Spidey's boss, J. Jonah Jameson. (00:10:30)
The Dark Phoenix (4): The Fate of the Phoenix - S3-E14
Trivia: After his hoverchair was destroyed by the Dark Phoenix in the previous episode, Professor X is provided with a new one in the Shi'ar starship. In the comics, Professor X's hoverchair was actually created using Shi'ar technology. (00:04:15)
The Dark Phoenix (3): The Dark Phoenix - S3-E13
Trivia: At around the 7 minute mark of this episode, Doctor Strange, Thor and Uatu the Watcher make brief cameo appearances. A few moments later when the Dark Phoenix is flying through space, the entity known as Eternity also makes a cameo appearance. (00:07:00)
The Dark Phoenix (2): The Inner Circle - S3-E12
Trivia: When the waiter is on the phone, he asks where his Chateau Calamari 59 is. This is a reference to Joseph Calamari, who has been Executive Vice President at Marvel Comics since 1986 and was also an executive producer on this show. (00:07:15)
The Dark Phoenix (2): The Inner Circle - S3-E12
Trivia: Wolverine's speech about his claws to intimidate the guard is a reference to Clint Eastwood's famous "Do you feel lucky, punk?" speech from the film "Dirty Harry." (00:05:20)
The Phoenix Saga (5): Child of Light - S3-E7
Trivia: Fellow Marvel Superheroes War Machine and Spider-Man make brief cameos during the montage of catastrophic events around Earth, although all you see of Spider-Man is his shadow and then his left hand when he shoots a web. (00:11:45)
The Phoenix Saga (4): The Starjammers - S3-E6
Trivia: Marvel Superheroes Captain Britain and Doctor Strange make brief cameo appearances when Phoenix departs the Earth with the X-Men. (00:04:50)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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