Endangered Species,' The Conclusion! It's the most world-shattering story to ever hit Knuckles the Echidna, and it all ends here! As Team Fighters make their way to the Arctic, Thrash and Knuckles collide in an explosive final battle for the fate of the Echidnas. So why is Silver the Hedgehog in the mix? Find out in this exciting finale! $2.99 cover price.