Thread:Doctorwhofan50/@comment-24922135-20190918155714/@comment-24922135-20190918194148

Thriller Whale is free to be used by anyone. Artwork for him, however, is still made by members of the fandom and therefore you must ask permission. Additionally, the planet and species Alan ascribed to him are fanon so you have to ask for those as well. You're fine to rework the reboot aliens into the original continuity, but again you cannot use other people's ideas without permission.