|"Jack Spicer, Evil Boy Genius"|
|Universe||Warner Bros. Animation|
|Debut||Xiadom Showdown (2003)|
|Appears in||Smash Bros Elite|
|Friends||Any Xiadom Warrior (Sometime)|
Ralph Star (Hired by him in Lawler RPG)
|Enemies||Any Xiadom Warrior (Sometime)|
Flandre & Remilia Scarlet (For destroying his lab in Lawler RPG)
|Lawl Team||Team Elite
Jack Spicer is a self-proclaimed "Evil Boy Genius" and one of the main villains. He is constantly building different types of robots, the most common is the Jack-Bot. His first appearance was in "The Journey of a Thousand Miles" where he met the Heylin witch Wuya and learned of the mystical Shen Gong Wu. He says that he has wanted to rule the world since second grade. His grandmother gave him his infamous heli-bot when he turned evil. As mentioned above, Jack is an experienced robotic engineer. Throughout the series, he often resorts to sobbing in public or screaming in terror due to his many defeats. Jack lives in his off-screen, wealthy parents' basement, which he uses as his "secret" lab. He has a younger cousin Megan, who sides with the Xiaolin.
Examples of Jack's "evil heroes" are Chase Young and Hannibal Roy Bean. Before these two showed up in the series, Jack was the dragon in training's most formidable enemy. He looks up to those evil heroes and tries to form partnerships with them, usually ending up with him getting hurt.
Later in the episode "Hannibal's Revenge" Kimiko disguises herself into looking like Jack to win a showdown. In the last episode, Jack is left with his favorite Shen Gong Wu, the Monkey Staff.
Role in Subspace Emmisary