Rainbow feels humiliated by Spike's trick, which made her date him. She seeks revenge.

Meanwhile, it turns out that Spike has a problem.

Can Twilight help him solve it? What cruel joke is Rainbow Dash going to pull on the little dragon?

Author's note: It's a side story to this story: http://www.fimfiction.net/story/57467/Everypony-Hates-Spike (but you don't need to read it prior to "Icky Revenge" but you can see the aforementioned trick there.)