|This article is about a/an monster in Battle Fever J.|
The Great Thief Monster (大盗賊怪人, Daitōzoku Kaijin) is the forty-sixth of Egos' Monsters. He could disguise himself as a human and had a cutlass that could return to him if thrown. Great Thief Robot also had a cutlass that could return to him if thrown and was able to jump high.
- Great Thief Monster were designed by character designer Ryuu Noguchi.