Stargate Atlantis
Season 4, Episode 16: Trio
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McKay, Carter, and Keller are trapped in an underground chamber while on an off-world mission, with no apparent means of escape.
All Episodes - Season 4
Episode 1
Adrift (2)
Episode 2
Lifeline (3)
Episode 3
Reunion
Episode 4
Doppelganger
Episode 5
Travelers
Episode 6
Tabula Rasa
Episode 7
Missing
Episode 8
The Seer
Episode 9
Miller's Crossing
Episode 10
This Mortal Coil (1)
Episode 11
Be All My Sins Remember'd (2)
Episode 12
Spoils of War
Episode 13
Quarantine
Episode 14
Harmony
Episode 15
Outcast
Episode 16
Trio
Episode 17
Midway
Episode 18
The Kindred (1)
Episode 19
The Kindred (2)
Episode 20
The Last Man (1)