- "You were born for a higher purpose -- to be the leader of our people."
- ―Charin to Teyla
While Colonel Marshall Sumner was somewhat dismissive of her, Major John Sheppard was much more friendly, and the two became quick friends. She soon became an integral part of Sheppard's team. (SGA: "Rising")
Teyla has a unique ability to sense the Wraith, due to one of her ancestors having Wraith DNA spliced into their genetic makeup. Since this was discovered, she has been able to make contact with Wraith minds on occasion, with varying degrees of success. (SGA: "The Gift", "The Siege, Part 1", "Submersion")
Teyla's leadership qualities is very respected in Atlantis and is often considered the unofficial third-in-command of Atlantis and have on occation been left in charge when both the current leader of the expedition and John Sheppard is away. (SGA: "The Lost Tribe", "No Man's Land")
After Elizabeth Weir disappeared and Colonel Samantha Carter was appointed Atlantis commander, Teyla took Doctor Jennifer Keller to New Athos for routine inoculations, only to discover that the Athosians were missing. After the offworld medical check, Keller discovered that Teyla was pregnant. A famed seer named Davos soon visited Atlantis. He privately told her that he was aware of her pregnancy and that the Athosians were alive, but he did not know where they were. Teyla has still not told Sheppard or Carter that she is pregnant, but Keller has reminded her that it will soon be obvious. (SGA: "Missing", "The Seer")
She is forced to reveal the truth to Sheppard, who takes her off the team in response. She later pilots a Wraith Hive Ship to a secret Wraith cloning facility and engages a Queen in mental battle, her own abilities boosted by those of her unborn child, but her baby is nearly killed and she realizes that Sheppard was right to take her off the team. (SGA: "Spoils of War")
She was later led into a trap by Michael and was captured. She learns that he was the one who kidnapped her people and turned many of them into Hybrids. He planed to use her baby to complete his research into creating the Hybrids. She was later rescued by the clone of Dr. Carson Beckett, but was quickly recaptured by Michael and taken away. (SGA: "The Kindred")
While Michael's cruiser engages the Daedalus, Sheppard, Ronon and McKay boarded the ship to find and rescue her. While Sheppard and Ronon take out the hyperdrive McKay is forced to deliver her baby, which turns out to be a boy. Teyla convinces Kanaan (the father of her baby and one of Michael's hybrids) to help them escape and got away in a Dart while the Daedalus destroys Michael's cruiser although it is speculated that Michael escaped on a cloaked puddle jumper. In the Atlantis infirmary Teyla decides to name her son Torren John, after her father and Sheppard. (SGA: "Search and Rescue")
Atlantis is invaded by Michael who once again wants Torren and despite planning to kill everyone else with the self-destruct, he offers to take Teyla with him so she can live. She refuses his offer and later escapes with Torren. Ultimately Teyla kills Michael by knocking him off a balcony at the top of Atlantis's Control Tower, but says that while he is dead, another will take his place as a threat to them.
Teyla has a good friendship with all of the members of her team, John Sheppard in particular. When the Expedition first made contact with her people, she didn't like Colonel Sumner very much but got along with Sheppard fine. The two became friends and she joined his team. Teyla trained him in stick fighting at his request. The two have a bond as both friends and warriors and Teyla even named her son after him.
With Ronon she has a bond of friendship as well as that of two warriors. Also she and he have a bond as the two 'aliens' of the team as they are not from Earth like everyone else.
With Rodney McKay she has a bond of friendship although she grows frustrated with him at times. They have somewhat of a special bond however as he delivered her baby for her on Michael's cruiser and he was technically the first one to hold her son.
Teyla is a part of the team that captures the Wraith later come to be known as Michael for experimentation. After he's transformed into a human, he feels a connection with Teyla so she becomes friends with him. Michael ultimately learns of the truth about himself and forces teyla to help him escape and nearly feeds on her until she's saved by Sheppard and Ronon. Later, when Michael returns during the failed alliance, he admits that while he was going to feed on her, it wasn't anything personal just his instincts. Michael approaches her after being recaptured to try to get the team to let him go free to find his own way, but is refused. After encountering Michael again, he nearly lets Teyla get fed on by an Iratus Bug as part of an experiment, but she is saved by Ronon Dex. She admits she feels bad for Michael. She knows he's too dangerous, but feels sympathy for him as it is their fault that he ended up like he did. After she gets pregnant by Kannan, Michael kidnaps her people and she swears vengeance on the person responsible, not aware that it is him. The two share some kind of connection, as revealed by Michael as he's able to reach across 10,000 light years and enter her mind to trick her with visions of Kannan in order to kidnap her in order to get his hands on her baby. Teyla is also able to sense when he's worried. While Teyla's his prisoner, Michael doesn't harm her and when she inquires of her fate once her baby is born, Michael is hesitant to tell her, indicating he still does care about her somewhat from their brief time as friends. When she calls him insane, Michael is actually hurt by it indicating her opinion of him actually matters to him. After her rescue, Michael comes after her again for her baby, but he offers to take her with him as he doesn't want her to die as he still does care about her somewhat. She refuses and escapes with Ronon's help. She considers his offer when he promises to spare her friends, but after exposing that promise as false, refuses. Teyla joins the final fight against him at the top of Atlantis' Control Tower and knocks him off the balcony. Michael is left at her mercy, but instead of saving him, she kicks his hands off the ledge, sending him falling hundreds if not thousands of feet, finally killing him. She does it because she knows he's too much of a threat and will never stop coming after her or her baby.
Teyla and Kannan were friends since childhood, bonding over having the same Gift of sensing the Wraith presence. As adults that friendship developed into a full-blown romantic relationship and Teyla ended up pregnant by him although she was unaware of it until later. Elizabeth Weir was not surprised by this as she could tell by how Teyla talked about him that she was in love with him. After Kannan and the other Athosians are kidnapped by Michael, she vows to find them and after being kidnapped herself, is horrified to find that Kannan has been transformed into one of Michael's Hybrids. At first he's too much under Michael's control to help her, but she manages to break through to him and he nearly releases her, but stops when Michael shows up. Kannan, after being broken through to by Teyla, retains his old personality, but is reluctant to help her escape as he fears for their lives and that of their child. After Michael's crusier is disabled by the Daedalus and Teyla is rescued by Sheppard, Ronon and McKay, Kannan helps them escape on a Wraith Dart and is later transformed by Jennifer Keller back into his human form. Kannan moves in with Teyla for at least a time on Atlantis and supports her decision to rejoin Sheppard's team, taking care of their child while she's away on missions.
- In an Alternate reality, when Sheppard traveled forwards in time by 48,000 years, he learned that Teyla had given birth to her child, but was killed by Michael, whilst the baby was used to perfect the Hybrids. (SGA: "The Last Man")
- In another alternate reality, Sheppard's team went onboard the alternate Daedalus and starved to death onboard the runaway ship. (SGA: "The Daedalus Variations")