Here's why Robot turned evil and invincible. Rudy, later known as Rex, began as a brilliant genius and a true hero, using advanced tech and droids to protect Earth while assisting the Guardians against villains. At first, his goal was simply to save lives, but everything started to change after he fell in love with Monster Girl. Their turning point came when they were trapped in the Flaxen Dimension, where they lived together for 700 years. During that time, Rex rose to power and became Emperor