Fred/The Grim Adventures of Billy & Mandy: Tricycle of Terror

Cast (in order of appearance)

 * Fred as Billy
 * Melody and OJ from Fun Song Factory as two girls working a lemonade stand
 * Kevin as Irwin
 * Boy (from Destination Imagination) as Pud'n
 * Evil World (from Destination Imagination) as Sperg
 * Purple Puppy (from Destination Imagination) as Wedding Seating Chart
 * Exculsiore (from Destination Imagination) as Pastor
 * The Dinosaur (from Destination Imagination) as Sir Raven
 * World (from Destination Imagination) as The Weird Kid in the Port-a-Potty
 * Bertha as Mandy
 * Pico (from Pico's School/Friday Night Funkin') as Grim