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E-107 Theta was sealed inside the Catacombs of Castle Mobius along with former king Shadow the Hedgehog, Tikhaos and the Anarchy Beryl Bomb. Little is known about Theta except that it must have been extremely dangerous as only the greatest threats to Mobius that had to be quarantined were kept in the Catacombs. (SU: #7)
- E-107 Theta at Mobius Encyclopedia, the Archie Sonic wiki