Team Logo. The Thunder Bay Thunder Cats were a team in the United Hockey League. They made the playoffs all three years under this name. In 1999 they moved to Illinois and became the Rockford IceHogs (UHL). Retrieved from "https://prosportsteams.fandom.com/wiki/Thunder_Bay_Thunder_Cats?oldid=17440" Categories: United Hockey League teams Teams in Ontario Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.