Sonic the Hedgehog 4: Episode I, the long-awaited return to 2D gameplay for the Sonic series, met with a mixed reception when it debuted on consoles in 2010. Part of its back to basics approach included ditching longtime partner Miles 'Tails' Prower, the flying fox with a voice that makes you just want to smack him. And of course, this guaranteed that Episode I was a single-player affair. But SEGA has recently released a teaser trailer for Sonic 4: Episode II that promises the return of Tails, along with classic nemesis Metal Sonic. Dare we hope that Tails' presence means that Sonic 2-style co-op will return as well?