The Coolest Coaster EVER! - Phineas and Ferb/Once-ler Crossover (Part 1 of 3)
Plot: This is basically based off the very first episode of Phineas and Ferb, (Rollercoaster), but with Smog and Onciebot as the latter. I don’t know why anyone hasn’t done this before.
There’s a hundred and four days
Of summer vacation, til school comes along just to end it