A Canterlot Wedding, Part 2 is the twenty-sixth episode of the second season of My Little Pony: Friendship is Magic and the second half in a two-part season finale. It aired on April 21st, 2012 on The Hub.
Twilight discovers a dark secret about Cadence right before the wedding. She is imprisoned by the imposter Cadence, finds the real Cadence, and they both escape to stop the fake Cadence. When Twilight and Cadence stop the wedding it is revealed that the fake Cadence is actually the Changeling Queen. Celestia tries to stop her, but fails and the changeling army breaks through the force field around Canterlot. The main six attempt to retrieve the elements of harmony and battle through a sea of changelings, but fail and are captured. All seems lost until Cadence uses the power of love to overpower and defeat the changeling Queen.