Summer School Blues is the tenth episode of Season 3 in Life with Derek.
Derek is forced to attend summer school. So, he sneaks out and injects some fun into Casey's dull camp curriculum. Meanwhile, Edwin and Lizzie set up a lucrative pet-sitting business.
Nora: Pet-sitting in the living room. (laughs) I don't think so.
Lizzie: But, Mom, you said to make the most of the summer.
Nora: I meant go out and get some exercise — not turn our living room into a... a zoo!
Lizzie: Mom, this place already was a zoo.