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Echoes is the twelfth episode of the third season of Stargate Atlantis, and the fifty-second episode overall.
Guest Stars: Claire Rankin (Dr. Kate Heightmeyer), Mitch Pileggi (Colonel Steven Caldwell), David Nykl (Dr. Radek Zelenka), David Quinlan (1st Scientist), Amanda Burke (2nd Scientist), David Neale (Ancient Pilot), Patricia Nudd (Ancient Woman), Michael Chase (Ancient Med Tech)
Teyla begins to see apparitions of ancients in distress and believes they are the ghosts of the Ancients recently massacred by the Replicators. McKay believes he's found the whale that saved him a year ago while trapped in a submerged puddle jumper.