Tomoyuki Oka
Tomoyuki Oka, better known by his ring name Great-O-Khan, is a Japanese professional wrestler signed to New Japan Pro-Wrestling (NJPW), where he is a member of the United Empire stable. A former NJPW World Television Champion and final official King of Pro Wrestling Champion, he is also a four-time IWGP Tag Team Champion with Jeff Cobb (2x), Aaron Henare, and Callum Newman. In 2026, he won the NEVER Openweight 6-Man Tag Team Championship alongside Henare and Will Ospreay. In recognition of his in-ring ability, he received Tokyo Sports’ Technique Award in 2021, Fighting Spirit Award in 2022, and Best Tag Team Award in 2022 alongside United Empre stablemate Jeff Cobb.
Oka began training with NJPW in 2015 and debuted in 2016 as part of the company’s Young Lion system before heading to the United Kingdom for an excursion with Revolution Pro Wrestling (RevPro), where he reinvented himself as Great-O-Khan and later captured the Undisputed British Heavyweight Championship. He returned to NJPW in 2020 as the first major member of Will Ospreay’s United Empire faction and quickly became one of the promotion’s most distinctive heavyweights, blending amateur wrestling, submission grappling, and his eccentric imperial persona. Known for his unconventional matches and crowd interaction, O-Khan gained further momentum in 2024 after reaching the G1 Climax playoffs and unsuccessfully challenging Tetsuya Naito for the IWGP World Heavyweight Championship. In 2025, he was ranked No. 137 in the Pro Wrestling Illustrated PWI 500.
Acting
TV
All Elite Wrestling: Dynamite
as Great O-Khan
2019
TV
All Elite Wrestling: Dynamite
as Great-O-Khan
2019
Movie
My Dad Is a Heel Wrestler
2018
Movie
AEW x NJPW Presents Forbidden Door 2022
as Great-O-Khan
2022
Movie
NJPW G1 Climax 33: Day 16
as Great-O-Khan
2023
Movie
NJPW G1 Climax 33: Day 17
as Great-O-Khan
2023
Movie
NJPW Dominion 6.11 in Osaka-jo Hall
as Tomoyuki Oka
2017
Movie
NJPW Wrestle Kingdom 15: Night 1
as Great-O-Khan
2021
Movie
NJPW x AEW x CMLL x ROH x STARDOM: Wrestle Dynasty
as Great-O-Khan
2025
Movie
NJPW Wrestle Kingdom 20
as Great-O-Khan
2026
Movie
NJPW Wrestle Kingdom 17: Night 1 in Tokyo Dome
as Great-O-Khan
2023
Movie
NJPW New Year Dash !! 2026
as Great-O-Khan
2026
Movie
NJPW Sakura Genesis 2026
as Great-O-Khan
2026
TV
Stardom on Stardom World
as Great-O-Khan
2011
Movie
NJPW G1 Climax 33: Day 11
as Great O-Khan
2023
Movie
NJPW G1 Climax 33: Day 1
as Great-O-Khan
2023
Movie
NJPW G1 Climax 33: Day 13
as Great-O-Khan
2023
Movie
NJPW Wrestling Dontaku 2022
as Great-O-Khan
2022
Movie
NJPW Dominion 6.12 In Osaka-Jo Hall
as Great-O-Khan
2022
Movie
NJPW x STARDOM: Historic X-Over
as Great-O-Khan
2022
Movie
NJPW Sakura Genesis 2024
as Great-O-Khan
2024
Movie
NJPW Power Struggle ~ Super Junior Tag League 2023
as Great-O-Khan
2023
Movie
NJPW New Year Dash !! 2018
as Tomoyuki Oka
2018
Movie
NJPW Wrestling Dontaku 2017
as Tomoyuki Oka
2017