Mizanin was sent to Deep South Wrestling (DSW) to train under Bill DeMott, relocating to McDonough, Georgia in the process. In July 2005, he wrestled two dark matches for WWE, teaming with former "Tough Enough" champion Matt Cappotelli to face The Highlanders (Robbie and Rory McAllister). On December 1, Mizanin defeated Mike Knox in the finals of a tournament to determine the inaugural Deep South Heavyweight Champion. He continued his partnership with Matt Cappotelli throughout the second half of 2005 in WWE dark matches and house shows until Cappotelli, nominally of Ohio Valley Wrestling (OVW), was diagnosed with a brain tumor after an injury at a taping in December 2005. After Cappotelli's death from brain cancer in June 2018, Miz revealed they were to be called up to the SmackDown roster as a tag team known as Reality Check in 2005, but these plans were halted due to Cappotelli's cancer diagnosis.