Luke James Uggles Eatwell, known by his ring name Zack Sabre Jr. and its abbreviated form ZSJ, is an English-born professional wrestler. He is signed to New Japan Pro-Wrestling (NJPW). In NJPW, he is the second and current leader of the group The Mighty Don't Kneel (TMDK) and is a former two-time and inaugural NJPW World Television Champion and former IWGP World Heavyweight Champion. He also makes sporadic appearances for partner promotion All Elite Wrestling (AEW) and its sister promotion Ring of Honor (ROH).