The Alphabetrians turned Water-T into Ice-T when he refused to care about anyone, and banished him from their world. He would only be able to return if he learned to care about other people.
After Ice-T helped save Earth from the Cromulons, he returned to his home planet to meet with the elders. Hydrogen-F and her fellow elders had heard of Ice-T's feat, and granted him back his original form. This was immediately followed by the Numbericons attacking Alphabetrium, causing a large rock to fall down on Helium-Q and kill him. Water-T drew his guns and attacked the Numbericons to avenge his father.