Prompted by the boys' decision to relive the day they built a rollercoaster, but this time breaking spontaneously into song from time to time, the episode stretches out the basic plot of the "Phineas ...

This time Phineas and Ferb decide not to fritter away their energy. They are going to build the coolest rollercoaster in their backyard! But to assemble such an enormous construction they need a good ...