Many of the best Nickelodeon series are rare, either having barely aired when they were new, or difficult to watch today.

For anyone nostalgic for classic Nickelodeon, underrated shows like As Told by Ginger and Mr. Meaty never have a dull moment.

Nickelodeon’s dedication to child-friendly programming has made it a leader in creative and original scripted and animated shows. People who grew up in the 1990s have especially fond memories of the ...