Ep 8. Gains Weight

When Phoebe is selected for a slam-dunk competition, she starts to express that she feels things would be better without gravity. Ms. Frizzle decides to show her what things would be like with different levels of gravity and she takes the students into outer space, where the magic school bus transforms into an entire planet where the level of gravity can be adjusted. However, things take a turn for the worse when the knob is actually turned all the way to super-gravity, which not only causes things to way a ton, it also severely hinders the students ability to move.