In the penultimate season 5 episode "Meridian", Daniel is exposed to a lethal dose of radiation while attempting to fix a naquadria reactor on the planet Langara in the Nation State known as Kelowna. The Ancient, Oma Desala, guides Daniel to ascend to a higher plane of existence. The Kelownan scientist Jonas Quinn takes Daniel's place on SG-1 during season 6, although the rest of the team find it hard to get over Daniel's absence. Ascended Daniel visits O'Neill and Teal'c during times of crisis, but the laws of ascended beings forbid him to directly interfere, with his visits simply consisting of providing moral support to his old teammates as they face torturous experiences on their own. In the season 6 finale "Full Circle", ascended Daniel seeks to aid SG-1 in defeating the plans of Anubis. Before Daniel can destroy Anubis, he is whisked away, but Oma helps Daniel by ascending the entire population of Abydos before Anubis destroys the planet.