ABC Family's Kyle XY stared his last blank stare, breathed his last bellybutton-less breath, levitated his last syringe full of bacterial growth from an old cup. (More on that in a minute.) The series about the supersmart, superpowered cutie taken in by the Trager family signed off for good last night, canceled after three seasons. And we must admit we'll miss the dreamy sci-fi teen. Here, a few reasons to mourn Kyle XY's passing