Stargate Atlantis - Series 4: Vol. 4

Episodes 13-16:
Quarantine: The entire team is held captive in various locations when Dr. McKay's quarantine feature accidentally sets off, locking all doors, and halting all communication!
Harmony: While visiting an off-world trading partner, Sheppard and McKay meet Harmony, the successor to the throne, a demanding child who has as many enemies as she does character flaws.
Outcast: Sheppard and Ronon meet Ava Dixon, who has created a dangerous human form Replicator that has escaped and must be recaptured - at all cost!
Trio: During an off-world mission, Carter, McKay and Keller become trapped in an underground mining chamber that's rocked by fierce seismic tremors.