Some time before Tails left the Zone, Shirob accidentally made contact with the Evil One, which drove him insane and transformed him into the monstrous Trogg. The other Enchanter Kings believed that Trogg had killed Shirob, so he was captured and exiled across the Dimension Bridge into the Land Beyond.
Trogg later assumed Shirob's form as part of a revenge scheme against Tails, who had defeated him (by chance) in single combat. "Shirob" pretended to be Trogg's prisoner and sent a message to his fellow Enchanter Kings, who soon sent help in the form of Tails and Errol Blackthorn. Trogg later revealed his true identity, but Tails and Errol were able to escape.
When the Evil One (also known as the Dark One) was eventually destroyed, Trogg slowly transformed back into Shirob. Now free of the Dark One's evil, he rejoined the ranks of the Enchanter Kings. As one of the Enchanter Kings, he later agreed to pledge allegiance to the Goblin Empire in order to avoid a costly and futile war.