E-107 "Theta" was a robot created by Dr. Eggman.
It appeared as a guard of one of the old Eggman bases used during the war. Sonic and Silver came across the sizeable robot while infiltrating said base. It threw a barage of projectiles at the heroes, as well as a horde of Spinas, but it was ultimately destroyed, freeing the small pig trapped inside. (StH: #8)
- Theta’s title implies that it is a part of the E-100 series first seen in Sonic Adventure, but this has yet to be confirmed.
- Theta physically resembles E-105 "Zeta", one of its supposed predecessors, also introduced in Sonic Adventure.
- Theta’s existence was first alluded to in the Archie Comics continuity, where it was first confirmed to exist through an entry on Archie's official Sonic comic blog along with other previously-unheard of robots in the E-100 series, and would later be name-dropped in the comic itself. Theta never made a physical appearance during the comics run, however.
- This technically makes Theta the first Archie Sonic-created character to be introduced to the IDW Sonic continuity.