Here Be Dragons Bob the Builder : Season 19 Episode 26

Bob and the team are building a bridged walkway over the Komodo Dragon enclosure at the zoo. Muck is terrified of Komodo Dragons, so he is instead clearing out an empty enclosure. When Muck finds eggs, he returns to the Komodo Dragon enclosure to seek Jenny's help. A Komodo hisses at him and he fearfully backs onto the walkway, which collapses, causing Leo to dangle in midair from his safety harness. Muck overcomes his fear and acts to save him. After the rescue, Muck and the team repair the walkway. Muck learns that the eggs he found were those of the Komodo and that he was cleaning their former enclosure. The eggs hatch, and Jenny names the first one after Muck.