|Introduced in:||The Shard of Lightning|
|Last seen in:||Time After Time: Part II|
|On the Wiki:|
Robo-Jack Spicer is an exact robot copy of the real Jack Spicer and is a regularly occuring villain in the series.
Robo-Jack is almost identical to Jack. He fears everything Jack fears, speaks like Jack and acts like Jack. Though the two Jacks initially work together to acquire the Shard of Lightning, and use it to play various pranks on the Xiaolin warriors, ultimately stealing some of their Shen Gong Wu.
Later, when going after the next Shen Gong Wu, Robo-Jack betrays Jack and they end up in a triple showdown against Omi. After Robo-Jack defeats Jack, Jack gets his revenge by telling Omi what he would do since they share thoughts, allowing Omi to defeat him. Robo-Jack had been taken out as Omi used the Tongue Of Saiping to call out animals that defeat him.
Jack later reactivates him with an obedience chip installed, though the chip clearly does not work as Robo-Jack claims to be the real Jack, and the two end up fighting.
Robo-Jack largely acts similar to Jack. He can change his voice to sound like a robot and can make it sound exactly like Jack to deceive people
Robo-Jack does not have a good relationship with his creator. This is shown several times as every copy of Robo-Jack betrays Jack. He seems to believe he is superior to his creator and always debates with him over who the real Jack is.