Stinging Glow Urchins

The Toxic Glow Urchins are sea urchins used as part of the Toxicity Challenge in Monsters University. The urchins are dark blue but glow a bright purplish-red when angry. Anyone stung by the urchins' spikes will swell up as if they were a balloon. According to Claire Wheeler and Brock Pearson, the urchins represent human belongings as monsters find actual human objects too toxic to be used.

In the first event of the Scare Games, the Toxicity Challenge, monsters from the biology class would scatter the urchins through the sewers and the six teams will have to traverse the sewers without touching the urchins, and the last team to reach the finish line will be kicked out of the Games. Unfortunately, Mike Wazowski and James P. Sullivan of team Oozma Kappa were constantly arguing with each other resulting in the other members of their team being left behind and swelling up after touching the urchins, and team OK to come in last, which would mean that they will all leave the University forever, according to Dean Hardscrabble. Fortunately, Team Jaws Theta Chi was disqualified instead as they were all caught cheating by using an illegal protective gel, allowing the OKs to keep participating.