Jumping Muck is the ninth episode of the twentieth season. It was written by Darren Jones.
Bob is building the jumps for Henry Corner's cross-country equestrian competition. Muck thinks the idea of jumping over things sounds like fun. Determined to find out, Muck sneaks away to build his own jump. But when he tests it out, he gets stuck. Lofty comes to the rescue, and Bob suggests using Muck's jump to finish the cross-country course.