While many remember the ’90s and early ’00s as a time filled with grunge music, body glitter and the World Wide Web, those who grew up in the era believe the real icons were NickToons and slime.

Remember those glorious 90s moments when someone on TV got absolutely blasted with green slime? Yeah, we lived for that. If you were a Nickelodeon kid, you know: getting slimed wasn’t gross, like ...