'Avatar' Actress Zoe Saldana -- To the Rescue After Bloody Car Accident

"Avatar" actress Zoe Saldana is one real-life badass action hero -- rushing to the aid of an elderly woman in L.A. yesterday ... after a car accident left a bloody gash on the lady's face.

According to reports, 33-year-old Zoe was driving along in Culver City when she noticed the accident and jumped into action -- helping the woman out of her car and onto the sidewalk.

Saldana called 911 on her cell phone -- and then stayed by the woman's side until an ambulance arrived.