Engine Nine, Feelin' Fine! — William Scollon

Donny doesn't want to play with his favorite toy fire engine, Lenny, anymore. So it's up to Doc to figure out what's wrong. Turns out, Lenny ran out of water for his fire engine hose, and once Doc refills him, he's as good as new! The gang learns a lesson about dehydration and the importance of drinking plenty of water, especially on hot days.