ALthough my son and I both liked and enjoyed this movie, i was very surprised it was only a PG rating. There is an extreme amount of very frightening imagery. No child under 12 should see this. There was a family with 3 young children seated behind me and it was obvious the children were scared and upset. The CGI of snakes on Medusa's head are so vivid and realistic and spend a protracted amount of time on the screen. Parents beware.