The Utroms are a species of small, tentacled aliens, vaguely resembling brains. They were stranded on Earth and interacted with humans through a front company, Techno-Cosmic Research Institute (T.C.R.I.). They are responsible for creating and losing the canister of mutagen that transformed Splinter and the Ninja Turtles. Eventually, they were forced to leave Earth by teleporting themselves to another world.


In the Mind's Eye[]

After entering The Upside Down, Leonardo, Michelangelo, Mike, Lucas and Will discover an Utrom amongst the human remains sprawled on the stairs in the subway. There is a pinkish goo covering the alien and Will uses his lighter to set fire to it. The goo becomes a smokey substance that drifts up out of the subway system and rejoins The Mind Flayer, a giant creature perched atop a tall building.

Bright Lights[]

The freed Utrom explains that after most of its kind left Earth, some of their kind, including it, were left behind. It and its partner were working alongside other Utroms at TCRI as they explored other means of interdimensional travel. The pair were successful with their creation, but not in the way they'd hoped. Their portal was only open a moment, but long enough for them to become ensnared by wisps of a great shadow. The Mind Flayer took control of the pair and their machine.