Greiger, known as Bommer in the Japanese manga was a contestant in the D1GP and like his anime counterpart entered the tournament to seek revenge on someone who wronged him in the past.
Greiger became the Mid-American Champion and developed a reputation as the "Undefeated Giant". However he was beaten by Jack Atlas in a Duel, after which Jack ridiculed him and was unimpressed with the fight Greiger had put up. Since then, Greiger has been set on getting revenge on Jack.
Greiger participates in the D1 Grand Prix. He was surprised when Jack patronizes the contestants, saying the Grand Prix seems to just be a consolation tournament.
He faces Yusei Fudo in the first round and vowed to crush Yusei in order to get his rematch against Jack. Greiger aimed for a One Turn Kill, which Yusei foiled. After Yusei started to put up a good fight, Greiger decided to bring out his "Sense Pressure", which he had been saving for Jack.
Even though Greiger Summoned his ace: "Blaze Fenix, the Burning Bombardment Bird" and put up a good fight, he was ultimately defeated by Yusei's tactics. After the Duel, Greiger looks upon his destroyed Duel Runner and his loss as his own fault for basing his Dueling and Sense off of his revenge and anger at Jack, he then wishes Yusei best of luck in the rest of the tournament.