Lois is embarassed because she doesn't know how to ride a bike. Reese teaches her how, but she has to overcome her fear first. Malcolm and Dewey find a mattress that falls out of the sky. It's the perfect one and they then sleep all the time. Dewey breaks out of it and then gets the old one back. He convinces Malcolm that it was all a dream. After Hal's tooth cracks at poker, Trey, who is a dentist, offers to fix it. Hal thinks it's for free, but Trey charges him. They start a feud.
This was a pretty good episode! I loved the Malcolm/Dewey plot and the Lois/Reese plot. I didn't really like Hal's plot though. This episode receives a 9.0 out of 10 from me!