Elle Driver, also known as California Mountain Snake, is a character in the movie "Kill Bill: Volume 1", played by actress Daryl Hannah. She is a member of the Deadly Viper Assassination Squad, led by Bill, and is one of the primary antagonists of the film.

Elle is a highly skilled assassin and is known for her sharp wit and sardonic sense of humor. She has a personal grudge against The Bride, the film's protagonist, and seeks to kill her in order to impress Bill.

Elle's weapon of choice is a small, silver syringe filled with a deadly poison, which she uses to kill one of her fellow assassins in an attempt to gain favor with Bill. She later engages in a brutal fight with The Bride, which ends with Elle losing her remaining eye and being left for dead.

Throughout the film, Elle is portrayed as a ruthless and cunning adversary, willing to do whatever it takes to achieve her goals. Her character is notable for her striking appearance, which includes a yellow tracksuit similar to the one worn by Bruce Lee in "Game of Death" and a distinctive eye patch.