Stargate: SG-1 Replicators

Season 3:
episode 322: Nemesis (1)

Season 4:
episode 401: Small Victories (2)*

Season 5:
episode 501: Enemies
episode 519: The Menace

Season 6:
episode 612: Unnatural Selection (part 2 of Prometheus)*

Season 8:
episode 801: New Order*