The Crew Builds a Skate Park / The Crew Builds a Tunnel "The Crew Builds a Skate Park": Mix leads the family in building a skateboard from the scraps they collected from the construction sites. Once that was done, Auntie Crane shows up and reveals that she is a skateboarding champion with Grandpa Gravel explaining this history. Rubble, Mix, Charger, and Wheeler build a surprise skate park for Auntie Crane as Grandpa Gravel and Motor work to keep her busy. They suffer a setback with the quick-drying cement when a duck family rescue ruins the skate park design. "The Crew Builds a Tunnel": Rubble learns that Charger is a fan of Sierra Sparkle who is going to have a concert in Builder Cove. In addition, Rubble & Crew learn that Grocer Gabriel is the father of Sierra Sparkle where she lives in a few towns over. He gets a call from Sierra who states that a falling giant boulder has blocked the road. Rubble & Crew head out to find a way to move the boulder. After each attempt to move the giant boulder fails even when Motor is called in and accidentally causes a landslide, Rubble & Crew work to build a tunnel by going through the rocks.