Does Chuck believe in the 'Ancient Aliens' (Also called Ancient Astronaut) theory that there are extraterrestrial beings that exsist from other planets?
The simple answer is no. Chuck does not believe that beings from another planet exisit or have visited earth in spacecraft. From the below articles, his Briefing Packages on 'Angels' and his book 'Alien Encounters,' Chuck essentially fit's 'Aliens' and 'UFO's' into two camps: Man-made or Spiritual beings.
Here is a list of articles on what Chuck has to say about 'Aliens':