Geoffrey manages to piece together half of Uncle Chuck's message from the damaged Shadow-Bot, and he and his secret service team embark on a mission to Robotropolis to retrieve it. Meanwhile, an incognito Sonic begins his quest for Arachnis and Tails, but is sidetracked by Geoffrey's mission. The intrigue thickens when both the secret service and Sonic are captured by Overlanders, and Sonic does his best to maintain his anonymity amidst his cellmates. Can Sonic aid in their escape without blowing his cover? Plus, surprising unexpected revelations about Robotnik and Tails! And what's with all the missing Overlanders?