Being able to change forms at will just comes naturally for a changling. But when Rogue loses this ability, he is also released from Queen Chrysalis' telepathic Control-Link control over him.
After the Battle of Canterlot is over, and he's the only changling left in all of Canterlot, he sets out to track down the lavender unicorn responsible, to thank her for saving him.
Little does he know that he would have the chance to return the favor very soon.
But how will Twilight and her friends react to this?
What will the Princesses have to say?
How will his former Queen take his rebellion?
Is Rogue really alone in his resistance?