Doppel Ganger is an outlaw changeling who has been living in the Everfree Forest for more than a year. Far from all the ruckus his Queen caused with the invasion, he spends a quiet life stealing love from Ponyvillians with his two friends, Camouflage and Mimic. But an encounter with a manticore will give him the worst thing he could catch, a cold.

This seemingly mild illness has terrible effects on changeling's physiology. At each sneeze, the changeling will either lose his disguise, or get a new one without any control over it. Now, it's harder to feed on ponies’ love unnoticed.

Doppel will have to feed on love in Ponyville during the duration of his sickness.