|Planet of Origin:||Thallidium|
|First Appearance:||The Promethium Closes|
|Last Appearance:||The Alias of the Inspector|
|Portrayed By:||Nigel Cuthbertson|
Thoraxis is considered to be the Eleventh Inspector's arch nemesis. He is portrayed by British actor Nigel Cuthbertson.
His past is unknown, and it was never revealed how he met the Inspector. He personally led the Union against the Infinity Knights and got trapped in the Time Wave. When he escaped with his followers, he set up a plan to trap the Inspector in the Promethium.
"BOW BEFORE THORAXIS!"