In the episode "White Out," it was revealed that Tunnel Rat was once on the same military team with Snow Job and Frostbite. In the episode "The Anomaly," it is revealed that Tunnel Rat has a brother named Teddy. The siblings work together in saving a friend who had been abducted by a Sewer Viper. At the end of the episode, Tunnel Rat goes to see his family. The reunion takes place off-screen, as the viewers only hear Tunnel Rat's mom yell "Nicky!?" in a surprised tone.
