Letters from Pegasus

S1, E17: Having learned that the entire Wraith armada is headed towards the city the Atlantis team prepares to send a data message to Earth with information about the Wraith threat and what could be their last messages home to loved ones. As the rest of the team records their touching and often humourous messages back home Major Sheppard (Joe Flanigan) and Teyla (Rachel Luttrell) embark on a reconnaissance mission where they witness the vastness of the Wraith army and look on helplessly as the Wraith cull the planet's helpless inhabitants.