With Pinkie Pie's birthday coming up, her friends find themselves facing a bit of a dilemma about how to celebrate it. Fortunately, Cheese Sandwich just so happens to come back to town, and he's more than willing to take over the party planning.

Pinkie is quite thrilled to know her party pal is back in town, but soon she can't help but notice that Cheese seems to be acting rather strange around her.

Will Pinkie be able to figure out why Cheese seems to be acting so odd? And what's the real reason behind Cheese's return to Ponyville?