Stargate Atlantis: Season 2, Episode 19

2 - 19: Inferno

Sheppard's team visits the planet Taranis at the invitation of two leading citizens, Dr. Norina Pero and Chancellor Lycus, who want McKay to repair a failing shield generator at an Ancient base they've discovered. Lycus also shows the team a massive Ancient warship, much like the Aurora, hidden in a vast warren of tunnels beneath the base. Although the warship is damaged and currently inoperable, Dr. Weir eagerly opens trade negotiations with Lycus as soon as she learns of its existence.