Mr. Conductor and FETCH! with Ruff Ruffman

Based on a 2015 creation, here is a crossover.

Cast

 * 1) Mr. Conductor 1, 2 and 3 (Ringo Starr, Alec Baldwin and Michael Brandon)
 * 2) Ruff Ruffman (Jim Conroy)
 * 3) Various Kids' WB! Contestants (Themselves)

Episodes

 * 1) 3-2-1 Blast Off! - Thomas Stories: Thomas Gets Tricked and Percy Runs Away