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Family patriarch and team leader, Mr. X is the typical sixties superspy, complete with a stylish black suit and extensive knowledge of hand to hand combat. Although he is a competent spy, he struggles with many everyday issues, such as remembering his name. He is also an excellent cook. In one episode, like Maxwell Smart, he had a "shoe phone" in which (like Mission: Impossible) it blew up after delivering a message. He is voiced by Patrick Warburton.
- Bumbling Dad: He's 100% behind his kids, he's also just as clueless.
Second in command, Mrs. X is fully trained in hand-to-hand combat and martial arts, but is an absolutely horrible cook. She often performs simple tasks with extreme measures (she used a death-ray device to kill a cockroach, destroying most of the kitchen and her daughter's room in the process). Despite a high capacity for violence and mayhem, Mrs. X is a devoted wife and mother, and will go out of her way to protect her family. She is an expert at tennis. She is known for administering savage beatings to Glowface (sometimes twice). Wendie Malick voices Mrs. X.
The X's teenage daughter and missions investigator. She is 16 years old. Tuesday is the most normal of the team, despite her rather extreme punk-rock garb and frequently changing hair-color. She is also the most knowledgeable of "real-world" behavior, which the other family members either misunderstand or ignore outright. She definitely takes after her mother in savagery and fighting skills, but at heart Tuesday is a genuine teenager who wants to do other things besides spy missions with her family. She easily gets annoyed with Truman and is not good at talk. She also likes Brandon, an agent from S.N.A.F.U. Tuesday's voice is provided by Lynsey Bartilson.
The X's 9-year-old son and technology expert. Truman, is a combination of Bart Simpson and Dexter from Dexter's Lab. Truman is the smartest of all the X's. He is voiced by Jansen Panettiere.
Truman's dog he got on his 9th birthday from Sasquatch. Rex was meant to kill Truman with Sasquatch controlling Rex with his mind control roar, but after Truman wouldn't fight him because he thought he would finally have the perfect birthday with him and Truman told about all the good times they had. After those words Rex broke free from the mind control and also all the other animals. Later, Rex became an honorary member for SUPERIOR. His first appearance was in "Boy's Best Fiend," and has since appeared in other episodes such as To Err Is Truman. Vocal effects are done by Dee Bradley Baker.
Home Base describes itself in the title sequence of The X's as "the house they live in", but Home Base is most likely the name for the computerized brain that runs the functions of their house (neither Mr. X nor Mrs. X appear to be competent about household chores, though Mr. X can mow the grass). Home Base serves as advisor, SUPERIOR contact and mission alert for the X's, and can be contacted from the X-Jet. It also serves as the (somewhat beleaguered) voice of reason in the family. Seen from above, Home Base is shaped like an X. Stephen Root voices Home Base.
The X's arch-enemy, leader of S.N.A.F.U, and the main antagonist of the series. Glowface's head is encased in a glass globe with electrical discharges. He wears a rubber suit and gloves to contain his vast energies. His schemes to get rid of the X's include having Trudy break her leg on a coffee table and sending them coupons for family portraits. Like traditional evil villains, Glowface is megalomaniacal, arrogant, loudmouthed and delusional, but he possesses little sophistication or maturity, and believes himself to be much more of a threat than he actually is.