Thunderpedia
- Fan run unofficial ThunderCats wiki that focuses on in-depth series and comics information.
- http://www.thundercatswiki.net

The Big Cartoon Database: Thundercats
- Features episode information including cast list, summary, and production notes.
- http://www.bcdb.com/cartoons/Other_Studios/R/Rankin_Bass_Productions/ThunderCats/index.html

Mumm-Ra's Pyramid
- A ThunderCats site featuring Mumm-Ra.
- http://tcats.shipunderground.com/index.html

Cheezey's Thundercats Zone
- Fan site featuring fan works, series information, downloads, unique games, and a forum.
- http://www.cheezey.org/thundercats/tcat.html

AOL Video: Thundercats
- Watch full episodes of The Thundercats on In2TV.
- http://video.aol.com/video-category/thundercats/2701

Guardians of Thundera
- Images, fan works, series information and a fan forum await you here.
- http://www.guardiansofthundera.co.uk/

ThunderCatsLair.org
- Fan site. Includes behind-the-scenes features, animation cels, a toy guide, comics and series information, and a forum.
- http://www.thundercatslair.org/

Return to Thundera
- A fan site featuring information, scans, screen shots, art and fan fiction, interactive games, downloads and media.
- http://www.thundercatsfans.org/

The Eye of Thundera
- Thundercats pictures, soundbites, toys, clips and forum.
- http://www.eyeofthundera.net/

ThunderCats Illustrated
- Illustrator Celesta presents this tribute to a childhood inspiration: her own drawings of the characters, together with an introduction to the series and a blog.
- http://www.tcsillustrated.net

IMDB: Thundercats
- Images, cast list, episode information, and a synopsis.
- http://us.imdb.com/title/tt0088631/

Queen Cheetah's Domain
- Contains information on the 1985 cartoon "ThunderCats", including related bibliographic listings. Items of ThunderCats fanon are also available.
- http://www.queencheetah.com/Thundercats

The Ultimate Thundercats
- Images of collectible figures and weapons listed by type, a message board, a character section and episode guide, as well as, links to toy pages and related sites.
- http://thundercats.vpga.com/