Written by Robert C. Cooper and directed by Martin Wood, the episode first aired in the United Kingdom on Sky One on February 11, 2000, and had its American premiere on Showtime on March 8, 2000.
Because the Replicators prevent SG-1 from retaking the bridge, Carter and Thor suggest placing an elementary naqahdah-enhanced bomb on the deceleration drive.
When Teal'c leaves the spaceship to place the bomb on the outside of the hull, his airtank blows, however, Carter manages to beam him back on board.
During the last shooting day of "Crystal Skull", Shanks suffered an appendicitis attack, which he had first misinterpreted as food poisoning from Thanksgiving dinner.
While Robert C. Cooper desperately tried to rewrite the script of "Nemesis", producer Brad Wright contrived elaborate storylines to reduce Shanks' involvement in the episode.
may reflect the actors' hairstyles which had significantly changed since the season 2 finale; the lines may have been added to appease the many viewers who had commented on the characters' new looks on the online boards.
[11][12] Jo Storm wrote that the "cleverly disguised action mini-arc" gives insight into the imperfection of the Asgard and that the "foreign, creepy" Replicators are "conquerors who make the Goa'uld look nice by comparison".
She felt that the episode had "all the classic elements of fiction", and lauded Robert C. Cooper's storytelling idea to take the Stargate from the SGC and Don S. Davis's following "best nonspeaking moment".