Sonic the Hedgehog, Vol. 2 #254 (2013)

Countdown to Chaos, Part Two: The Soldier
'Countdown to Chaos,' Part 2. The long-awaited debut of the new Freedom Fighters continues! The mysteries deepen as Sonic and Tails find their long lost pal Antoine! But what is the state of our formerly fallen fellow freedom fighter? What has Uncle Chuck's research uncovered about the nature of the dark power they've found seeping from the earth? And an unlikely return of a character you won't expect alongside Uncle Chuck! Plus, Eggman versus G.U.N. and the prize is Eggman's life!
Release Date: 2013