When does Generator Rex return?

The series premiered in the United States on April 23, 2010, on Cartoon Network, and concluded on January 3, 2013, with a total of 60 episodes. It is based on the comic M. Rex, created by Aaron Sowd, Joe Kelly and Duncan Rouleau, and published by Image Comics in 1999. A two-part crossover special with Ben 10: Ultimate Alien titled Ben 10/Generator Rex: Heroes United aired on November 25, 2011.