A crossover with the "Sonic the Hedgehog" series, the story follows Knuckles and King Acorn's Secret Service#Members#Geoffrey St. John|Geoffrey St. John's King Acorn's Secret Service|Secret Service as they journey into the Forbidden Zone (the location of Haven, the base of operations for the Brotherhood of Guardians). The Secret Service are looking for Queen Alicia and Knuckles is searching for answers about his past, and they are both shocked to find Elias Acorn, an heir to the Acorn throne nobody had previously known about. This story, though lacking much in the way of action or adventure would have huge ramifications in the "Sonic the Hedgehog" series.