Episode 25 of "Malcolm in the Middle"
s02e09 High School Play

When Malcolm is recruited to take a role in a high school play, he finds himself one of the hanging out with the "cool" kids. The "Krelboynes" soon become upset with Malcolm for deserting them for the high school crowd and not helping with their secret project. When the night of the play arrives, Malcolm get stage fright and it's up to his neglected "Krelboynes" to bail him out. Meanwhile, Lois discovers a cheap massage table at the local mall and is soon addicted to the fabulous massages. Completely relaxed and in a state of bliss from her mall excursion, Lois doesn't even mind that Hal and Dewey have built a giant Lego city which takes up the entire living room.