‘BEN 10’ creator Duncan Rouleau wanted to create an “MCU type universe” for Cartoon Network: “Gen Rex was one of those characters. Unfortunately it was too big of an idea for the network. Ben has shown up in other shows, but the problem with those type of crossovers is the audience expectations for their favorite characters are not always met.” This fits with prior statements by Jay Stephens, who also mentioned The Secret Saturdays and Sym-Bionic Titan