The Watchers (Aramaic עִיר iyr, plural עִירִין iyrin; from the Hebrew root `er meaning "awake, watchful"; Greek: ἐγρήγοροι, egregore; Slav: Grigori; poss. meaning "those who are awake", "guard") is a term used in the Book of Daniel and the Book of Enoch as an alternative expression for "angel", or a type of angel, or holy one. The Book of Enoch primarily focuses on a rebellious group of Watchers who lusted after human women, then took for themselves wives who in turn bore giants. The Enochian giants are commonly associated with the Hebrew term nephilim, found in the Pentateuch (Genesis 6:4; Numbers 13:33).
It is believed that the Watchers are not really angels, but Extraterrestrials who are mistaken for angels.