|“||That's the reason we're all here, to protect each other, and to live peacefully without war.||”|
— Alexis to Ben in Chinatown
At least 9 months into the invasion Anne found out she was pregnant with Tom's child. The baby was born at least 7 months later. Tom announced the baby's name at the forum. Alexis showed signs of being "advanced" early on, being able to pull herself up in her bed, move around freely, track movement, and talk only a week after being born- actions which were only seen by Anne and which frightened her.
Dr. Kadar later explains to Weaver and the others that this meant Alexis is a human-alien hybrid, an entirely new species. Fearing that the revelation of a hybrid child might cause the citizens of Charleston to harm her child, Anne knocks out both Kadar and her friend Lourdes (who was secretly implanted with Espheni eye worms, making her an unwilling Espheni agent) and flees, but she and Alexis are soon captured by the Espheni.
2 months after Alexis is born, she and Anne are found by Tom after the attack in Boston. Alexis' alien DNA has caused rapid growth; she is physically now six years old and fully capable of speech. When they get to safety in the resistance, Anne spend her time resting in a tent. Meanwhile Alexis is approaching the cage for Lourdes who's still bound to the eye worms. As Alexis touches her chin, she cures Lourdes and the eye worms are dragged to her hand instead. As her father Tom and Weaver are watching, she kills the eye worms by closing both of her hands and later when she opens them, the eye worms have vanished and turned into dust.
22 days after travelling back to Charleston and safety, the 2nd Mass is finally near home. However, things are not so simple as the Espheni attack heavy and hard with new weapons never before seen. Just before the attack, Lexi makes an ominous comment, "We don't all have to die here." . As the Espheni is dropping large obelisks that create a grid that keeps everyone grouped together on the 2nd Mass forces, separating loved ones, Ben grabs Lexi and runs off with her to safety along with Lourdes and Maggie.
4 months pass in which Lexi continues to change, she now has platinum-blonde hair, blue eyes, pale skin. She sets up a safe zone for Ben, Maggie, Lourdes and many others. When Ben wakes up from a coma, he notices her as a young woman with a long white dress. He notices Alexis's necklace and ask her what it is, to which she replies unity. Confused he asks her who she means and she calmly replies "All three of us.". After a moment of silence, Lourdes tells Alexis that everyone is ready for her, and she is thanked for bringing these news. She then comforts Ben and tells him that she is protecting him now instead of the other way around. Too confused by the situation, Ben tells his half-sister that they should find Hal and the other family members, but Alexis promises Ben is safe in Chinatown. At night while she is meditating, some moonlight comes in through the window, which she then touches, and makes it chime.
|Season 3 appearances|
|On Thin Ice||Collateral Damage||Badlands||At All Costs||Search and Recover|
|Be Silent and Come Out||The Pickett Line||Strange Brew||Journey to Xilbalba||Brazil|
|Season 4 appearances|
|Ghost in the Machine||The Eye||Exodus||Evolve or Die||Mind Wars||Door Number Three|
|Saturday Night Massacre||A Thing With Feathers||Til Death Do Us Part||Drawing Straws||Space Oddity||Shoot the Moon|
- She marks the beginning of an entirely new species. Unlike any other human, Alexis has alien DNA in her blood.