The Transmat is an Utrom invention similar to Professor Honeycutt's Teleportal. It appears in the Mirage Comics, 2003 TV series, and the games Teenage Mutant Ninja Turtles 2: Battle Nexus and Teenage Mutant Ninja Turtles Smash-Up. It teleported the turtles to an alien planet. In the story Terror by Transmat!, A larger Triceraton invasion force have apparently stumbled upon a transport station on Gavat-4 and the three Triceratons within the transport station on the Utrom homeworld intend on activating the transmat devices and inviting their invasion force in. The Turtles, Honeycutt and the hostages make it to the transmat platform and beam out just as their charges detonate the facility, leaving behind thousands of enraged Triceratons. Leatherhead tried to build one in the issue Leatherhead, Too and the episode What a Croc, so he can travel to the Utrom homeworld. In the Image Comics series, together with Dr. X, Leatherhead managed to assemble a new Transmat Device, unfortunately, when testing it, the signal projected from the device ended-up luring a group of Triceratons to Leatherhead's lair.
Unfortunately, while battling the last remaining Triceraton, the Triceraton activated a "portable, short-range matter transponder", and transported Leatherhead and the unnamed Triceraton to parts unknown. In the 2003 TV series episode Same As It Never Was future Ch'rell forces the Utroms to build one for him. With it, he planned to send forth his armies and enslave the stars, one world after another. But he was killed by Donatello before he got a chance to put his plain into action. It's revealed in the 2003 episode Secret Origins that the waste products from the Transmat are the Ooze that caused the Turtles' mutation.
In the game Teenage Mutant Ninja Turtles Smash-Up, The Shredder captured Fugitoid in order to force him to make a Transmat to teleport his armies all around the world. At the end of the game Honeycutt flips the switch on the Transmat, which Shredder and Karai have landed on, and teleports them to parts unknown.