He competed for the UFC in the Middleweight division where he was ranked 13th until his release, and won The Ultimate Fighter Nations: Canada vs. Australia.

[4] Theodorou was born and raised in Mississauga, Ontario, of Greek descent, and attended Meadowvale Secondary School.

After semifinals, he went to Phuket Province, Thailand, to train at Tiger Muay Thai with coach Patrick Côté.

Theodorou defeated MFC vet Sheldon Westcott via TKO due to punches and elbows in the second round at The Ultimate Fighter Nations Finale to win the Middleweight tournament.

[14] The bout remained on the feet for nearly all of its duration in a largely uneventful fight where neither fighter was able to deliver any significant offense.

[32] At the first bout after UFC release, Theodorou fought Hernani Perpetuo at Prospect Fighting Championships 12 on December 6, 2019.

[35] Theodorou faced fellow UFC veteran Matt Dwyer at Rise FC 6 on March 13, 2021.

[38] Theodorou and his ex-girlfriend, Max Altamuro, a retail manager living and working in Toronto, competed on the third season of The Amazing Race Canada.

[41] Theodorou was involved in an upcoming film called Last Hit in which he will portray an MMA fighter who is forced to retire but then takes up e-sports.

[4][44] Theodorou used cannabis to treat the pain and discomfort from bilateral neuropathy, a nerve condition resulting from an accident that broke his hand in two places and fractured it in four.