sonic55SA-55 is the secondary antagonist of the 2008 platform game Sonic Unleashed. He is a robot built by Dr. Eggman, serving as his rht-hand assistant and advisor during the Dark Gaia incident. However, despite his loyalty to Dr. Eggman, SASonic IDW (new issue #77 added) - read all issues on for free with no ads. Sonic the Hedgehog is an ongoing American comic book series based on the Sega video game