Vexus (formerly Queen Vexus) was the main antagonist of My Life as a Teenage Robot. She is the former master of The Cluster and the arch enemy of XJ-9/Jenny Wakeman. She has clashed with Jenny many times before, nearly succeding each time but ultimately fails. Her Second-In-Command is Smytus.
She was voiced by the late Eartha Kitt who also voiced Yzma. She is currently voiced by Cree Summer.
Vexus was the reigning monarch of Cluster Prime and commander of the Cluster, and is still one of XJ-9's most common foes. She rarely gets the upper hand, however. Her name is likely a pun on "vexen".
She possesses the ability to transform, but typically for means of disguise, compared to the multitude of battle forms that Jenny typically uses. Her known forms are as the photographer, a robotic nurse in "Tradeshow Showdown", another robot girl named "QT2" in "Designing Women", a girl named "Violet", and as "Vicky" in "Queen Bee".
In the film Escape from Cluster Prime, it was revealed that Vexus had a daughter named Vega.