An actor whose fanbase exhibits a noticeably higher percentage of rabid devotion than what is typical of fandom in general, especially given the (usually small) size of said fanbase. One tell-tale sign that you've got a Cult Actor on your hands lies in how well and to what degree they are known to the general viewing public: If someone is a Cult Actor you should expect to be met with either a blank stare or an endless stream of uncontrollable gushing about said person upon mentioning their name in conversation.