A few years after the events of Twilight Time, the Cutie Mark Crusaders found their special talents and put them to use by drumming up business for themselves. But what happens when somepony takes advantage of them and decides to use their skills for a sinister purpose?
Wow, Trixie sure is an idiot, I don't think she noticed that at least a third of the town is made up of unicorns who can either detonate the bomb or just teleport out.
But then, I do understand that she's also probably insane and it simply slipped her mind.