"Evolution" (Parts 1 & 2) are the 11th and 12th episodes from seventh season of the science fiction television series Stargate SG-1. Part 1 was co-written by Damien Kindler and Michael Shanks, with Kindler adapting the story into a teleplay, whilst part 2 was written by Peter Deluise and Damien Kindler, with Deluise handling the teleplay as well as directing the episode. Part 1 was first broadcast on August 22, 2003 on Sci-fi Channel in the United States, with part 2 subsequently airing first in the on Sky One in United Kingdom on December 14 2003, following the shows mid-season hiatus in the US.