Some of the best characters in classic TV shows were kids. Toddlers, teens and every age in between told jokes on sitcoms, explored the far reaches of space in sci-fi shows and helped out on the frontier in Westerns.

Many are still so iconic, it’s easy to recall their names. But could you spell them down to the last letter?

Here are 15 kid characters from some of our favorite shows. Try to guess which letter is NOT in each kid’s name. Just to clarify, we mean the characters’ names, not the actors'. We’re also using each kids’ full first and last name. Good luck!