Glacius is slightly more reasonable and upbeat than his buddy Swelter, although that's not saying all that much. This Mini-Con uses his icy blasts to freeze his enemies solid; when combined with Swelter's (literal) firepower the duo can melt and re-freeze metal to trap their enemies. Although both Mini-Cons hired themselves out to various Decepticons back on Cybertron, they've fallen in with Razorpaw since arriving on Earth, a less-than-ideal partnership. This newfound fear of their master is pretty much the only thing keeping both Mini-Cons from going their own way.
Swelter and Glacius regularly teamed up with Decepticons. They were imprisoned on the Alchemor only to be freed when the ship crashed on Earth. There they teamed up with Razorpaw, despite the fact he treated them poorly. When Optimus Prime's team appeared on the hunt for Razorpaw, they attacked the former Autobot leader and even defeated Drift's Mini-Cons, Jetstorm and Slipstream, but retreated when faced by the other Autobots. They brought the team of trackers to Razorpaw's attention, and accompanied him as he followed them to a military base where the pair succeeded in trapping Drift and Sideswipe in a metal cocoon. They followed that up by taking out Optimus himself, but it turned out Optimus had been feigning, and while the pair argued with Razorpaw, Optimus defeated the trio.