Bob the Builder 2018 Episode 3-4 Fess Up or Mess Up / Bob's First Build Episode Title: Fess Up or Mess Up / Bob's First Build Episode Description: Fess Up or Mess Up:When Muck secretly takes Leo's newly built robo-racing vehicle with him on a build, the toy goes haywire and he tries to solve the problem on his own. Bob's First Build:When Muck feels bad for collapsing Bob's first build - his old shed, Scoop tells him the story of how the young Bob built it and all the mistakes he made along the way.