to eliminate the Wraith's need to feed on humans, but this led to a betrayal by Todd when he believed that Sheppard activated the Attero Device to destroy the Wraith at the cost of any activated Stargate in the Pegasus Galaxy. Despite this, Sheppard continued working with Todd when the situation called for it. In the series finale, Enemy at the Gate, Sheppard learned about a new, more powerful hive ship from Todd and worked to stop it from reaching and destroying Earth. When all else failed, even Atlantis, Sheppard boarded the ship with a nuclear weapon in a suicide mission to save Earth. Sheppard succeeded in destroying the hive ship and saving Atlantis and Earth, but, due to a surprise appearance by the rest of his team, survived the experience. He later joined Atlantis' senior staff as they looked out over the Golden Gate Bridge from Atlantis, which had landed on Earth in the aftermath of the hive ship's attempted attack. John Sheppard learns how to fly a Wraith dart in the season 2 episode "The Lost Boys". He later pilots one in "The Hive", "Vengeance" and "Search and Rescue" as a way to escape Wraith ships. Characterization John is one of the more laid-back, easy-going personalities on the Atlantis Expedition. He is capable under pressure, an excellent marksman, and outstanding pilot. He is very instinctual and frequently is able to come up with ingenious solutions to complicated problems. Some put this ability down to his being a closet mathematical genius, despite little scientific training. He also has displayed the ability to keep up with much of Rodney McKay's complicated plans. But despite this, he tends to be relatively humble—being able to accept that sometimes there isn't anything he can do to help to resolve the current problem, and leaving it up to more capable minds. He has also occasionally shown a darker side; he did not hesitate to take action that killed over 50 Genii soldiers when Kolya was trying to take over the city in The Storm. He also supported using torture on a former Atlantis colleague to gain information in Critical Mass Also in the episode, Millers Crossing, he talked Henry Wallace, the owner of Devlin Medical Technologies, into sacrificing himself to a Wraith. When McKay voiced his discomfort over this, he replied that he merely presented a situation. He told McKay that the report would