After the success of the 5-time Allan Cup champion Thunder Bay Twins, the Colonial Hockey League took interest in expanding to the Northwestern Ontario city. In 1991, the Colonial league introduced the Thunder Bay Thunder Hawks, spelling the end of the 21-year Twins franchise that stepped aside for the new Semi-Pro team. In 1993, the team changed its name to the Thunder Bay Senators to reflect the teams affiliation with the National Hockey League's Ottawa Senators. Soon after, the CoHL changed its name to the United Hockey League and in 1996 the team became the Thunder Bay Thunder Cats.