The doctor is in — now with a new theme song! Glee alum Amber Riley recently lent her impressive pipes to the popular Disney Junior animated series Doc McStuffins, whose 4th season premieres Friday.

Donny thinks that his toy fire engine Lenny, a.k.a. Engine 9, is broken, when it actually ran out of water in his holding tanks, so Doc refills him. Song: Water, Water Sickness: Dehydration (Dry-out) ...

Doc McStuffins special, “The Doc Is In,” shows good habits, including hand hygiene and staying hydrated, to empower kids to help take care of their health.

Doc McStuffins does what the best children’s TV shows do—it creates a new universe that kids find both fun and reassuring, and it uses that world to connect, gently but firmly, to the real world.

Doc McStuffins is one of the most successful new cartoon-series launches in recent years, and like a lot of children’s programming, it’s also a good show.

"Doc McStuffins" is mostly designed to entertain, a minus for parents of preschoolers, who typically want educational components (like the way Dora teaches Spanish and problem solving).