In France, where the ThunderCats are known as "CosmoCats", an exclusive encyclopedia was released in 2004 which was offered to a few people that purchased the DVD’s . The book was titled "La Collection Les Series Cultes Cosmocats". This 180 pages CosmoCats Encyclopedia was packed full of colorful illustrations and drawings of the various ThunderCats characters. Each illustration was also accompanied by profile description of the character in French.