After several missions with SG-1, Jonas is confronted with his past in "Shadow Play" and learns more of the effects of naqahdriah on people. In "Metamorphosis", the Goa'uld Nirrti learns via an Ancient DNA Resequencer that Jonas is different from other humans, but she is killed before this is further investigated. In "Prophecy", Nirrti's experiments cause clairvoyant visions in Jonas, and the doctors remove a potentially lethal tumor from his brain. After SG-1 finds the de-ascended Daniel on another planet in the season 7 premiere "Fallen"/"Homecoming", Jonas and Daniel join forces and succeed in driving Anubis away from Kelowna. The three Langaran nations agree to meet for peace talks for the greater good of the planet, and Jonas decides to become a peace negotiator for his people. While Jonas returns to his planet, Daniel rejoins SG-1. Jonas last appears in season 7's "Fallout" to ask Earth for help saving his homeworld from the destructive powers of naqahdriah in the planet's core. Season 10's "Counterstrike" mentions that the Ori conquered Langara, Jonas's homeworld. Langara's story arc is resumed in Stargate Universes "Seizure", where Earth eventually agrees to protect Langara from the Lucian Alliance, while the Langarans remove the Stargate from their facility. Characterization and relationships After Daniel's death and Jonas' subsequent move to Earth, Major Carter is the SG-1 team member around whom Jonas Quinn feels most comfortable. Nevertheless, Amanda Tapping (Carter) felt that "there is a hesitancy on [Carter]'s part to be too familiar with Jonas [or] make this big emotional investment" in him because he is not Daniel. Jonas hopes that Carter and the alien SG-1 member Teal'c can persuade Colonel O'Neill to give him a chance to prove himself worthy of a place on the SG-1 team, but according to Richard Dean Anderson (O'Neill), "O'Neill feels that Jonas is directly responsible for the demise or at least the damaging of Daniel Jackson [and thus] harbors some resentment towards Jonas". Although O'Neill is suspicious of aliens in general (except of Teal'c), O'Neill begins to accept Jonas at the end of "Redemption" yet finds it hard to ever significantly warm up to Jonas, something which Nemec felt "makes things much more interesting". Tapping added that Jonas inadvertently brings the three remaining SG-1 members closer together again. Jonas's "easy-going nature" later helps him to also establish relationships with the supporting characters Dr. Janet Fraiser and General George Hammond, whom Nemec regarded