He provided the voice of the characters Solid Snake and Big Boss in the video game series Metal Gear Solid. Hayter wrote the screenplay for the X-Men movie and co-wrote the sequel X2. He has directed the films Chasm and Wolves and also wrote for The Scorpion King, Watchmen, Chasm and Wolves. Hayter will a director, producer, and writer for the upcoming 2015 mini-series World War III. He won a Saturn Award for Best Writing for X-Men in 2001.