Amy Pond: How did he-
The Doctor: One word...Discord. Him reversing the frequency of his molecules caused a chain reaction that gave Linkara the Infinity Gauntlet back. But thankfully, it's all been taken care of. The Eye of Agamotto is back at the Sanctu Sanctorum, and the Infinity Gauntlet is back at the vault in Galifrey, alongside the Tesseract, the Aether, the Odinforce, the Orb and the Starheart.
Amy Pond: Ego's death, Princess Luna getting her Cutie Mark switched, Discord rejecting chaos...why can't the universe ever get a break?
The Doctor: I ask myself that same question a lot.