From Sonic Retro
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Thelxe confronts Sonic and Thebes on Voxai Colony Beta, as the Overmind prepares to send a Chaos Emerald through the Colony Alpha teleport gate. After being knocked out by Sonic's group, Thebes extracted the teleport code from Thelxe's mind and imprinted it on Sonic's, allowing the heroes to travel to the Overmind's inner sanctum. The last we see of Thelxe is as Sonic departs for Colony Alpha; Thebes stays behind on Beta, to "keep his mind on" the enemy Voxai.