Greiger is a minor antagonist from the television Show Yu-Gi-Oh! 5Ds.
He was voiced by Sean Schemmel.
He was originally a duelist hired by Rex Goodwin to test the power of the signers during the Fortune Cup, but later became a Dark Signer when he found out that Rex Goodwin was the one who destroyed his home village.
As a Dark Signer, Grieger wields the dark sign of the Whale. Greiger wields both a ground deck and a turbo deck. Both of Greiger's decks are Reactor decks. These decks wield Monster Reactor SK, Trap Reactor Y FI, and Spell Reactor RE, which can combine for form Flying Fortress SKY FIRE.
However, when Greiger became a Dark Signer, his turbo deck was similar, but had a few differences. An example is having the Dark Synchro monster; Dark Flattop, and his strongest monster; Earthbound Immortal Chacu Challhua.
- Greiger is the only Dark Signer that was defeated by a duelist that wasn't a Signer.