The Construction Zerbies decide to build a water trench right through the middle of town. The problem is, while they are building it, Zerbies still need to drive past. They need to come up with a way that Zerbies can get across the ditch they are digging while the construction Zerbies continue to work. They start by making a bridge out of dirt. This works great for Zerbies who want to cross the ditch, but it makes it hard for the construction Zerbies to drive back and forth. Next they try making a bridge out of logs. The idea is for the Construction Zerbies to go under the bridge, but the ditch isn't deep enough yet for that to work. Strut picks up one end of the bridge so Fill can get to Rex and they realize the solution.
Fran and Zack depart from a beach on Zerby Town Lake to pick up Rex, who has a giant log to take back to the other shore. But when Fran drives back with Zack, Rex and the log, she runs aground in the shallow water. Bob the Boat tries to push and Strut the Crane tries to pull, but Fran is stuck. They realize it's because Fran is carrying more weight, so she is sitting lower in the water. Zack solves the problem by jumping into the water with his life-jacket and swimming to shore.
While moving their garages around, Zack can't find anywhere to put his garage near Axle's. They decide Zack's garage should go on top of Axle's. This creates problems when they realize finding a solution for getting in and out of the second story garage isn't going to be easy. Zack falls out of his garage as soon as Strut puts it down. Then he can't get back up. They call Fill the Front-Loader to build a ramp up to Zack's garage. The ramp works perfectly, except it goes in front of Axle's garage door and Axle can't get out. They remove the ramp and try, try again. Axle realizes that if they turn Zack's garage sideways then Zack can have a ramp up the side of Axle's garage, and Axle can still get in and out.