A.L.I.E. is a main and overarching antagonist (along with Charles Pike) in the third season of The 100. A.L.I.E. is the one who set the series events into motion by destroying the planet. In the sixth season, A.L.I.E. returns as a fragment of herself in Clarke Griffin's mind, helping to protect the young woman from being erased by the Lightbourne family.
She was portrayed by Erica Cerra.
She is an artificial intelligence created and physically modeled from a scientist, Becca Franko. She works with chips that the person swallows and his/her mind is kept in this chip. A.L.I.E. can then control the minds of all people who swallow the chip. The advantage of this invention is that it removes the pain, however, it also erases the memories of the person in question. While A.L.I.E. was created to make mankind better, she determines that the problem is overpopulation. For that reason, she started a nuclear war and succeeded in spreading via the internet.
A.L.I.E. was created by Doctor Becca Franko in order to make life better mankind. However, the AI came to the conclusion that the root of the problem was, in her own words, "too many people," or overpopulation. Becca locked A.L.I.E. away and went to space to work on her replacement, A.L.I.E. 2.0, also known as the Flame. However, the AI broke free and initiated a worldwide nuclear strike that killed the majority of the human population, stated at one point to be 11 billion people. The survivors of this nuclear apocalypse believed that it was a war between countries, unaware that it was actually a rogue AI.
At some point, people such as Emori and her brother Gideon became aware of A.L.I.E., still existing on Becca's island and began working for her. Stories of the City of Light, a virtual reality created by A.L.I.E., also began circulating.
The City of Light
After arriving on Earth from the Ark, Thelonious Jaha learns of the City of Light and sets out to find it with a small group including John Murphy. In a bunker beneath the lighthouse on Becca's island, Murphy finds a video by one of A.L.I.E.'s creators Chris who blames himself for failing to stop the AI from destroying the world before he commits suicide. At the same time, Jaha follows some of A.L.I.E.'s drones to the mansion on the island where he encounters the AI herself in holographic form. Jaha quickly deduces her true nature and A.L.I.E. leads him to the nuclear missile that he came to Earth in, stating that they have work to do.
Over the next few months, Jaha builds the missile's warhead into a portable power pack for the AI and her server before departing the island to convert people into joining the City of Light. In the City of Light, A.L.I.E. stores people's consciousness to the point that they can survive even after physical death. Jaha is able to get people such as Raven Reyes to take the AI's chip connecting them to the City of Light willingly before resorting to more extreme methods such as force, threats and torture. Jaha ultimately gets Arkadia, Polis and the vast majority of the human race to take the chip, leaving only a small group of people not under the AI's control. At the same time, A.L.I.E. searches for the Flame, the second version of A.L.I.E. created by Becca which acts as her only weakness.
During this time, the group who has avoided falling under A.L.I.E.'s control, led by Clarke Griffin, manage to free Raven by using an EMP to fry the chip. In possession of the Flame, the group attempts to find a Nightblood to take the Flame and destroy A.L.I.E. However, the only known Nightbloods are the tyrannical Ontari who is already under the AI's control and Luna who wants nothing to do with the conflict. A.L.I.E.'s followers attack Luna's oil rig, but are driven off, but not before Jasper Jordan falls under her control.
In Polis, Murphy and Charles Pike attempt to destroy A.L.I.E. by smashing her power pack while Raven hacks into the City of Light to try to destroy the AI from the inside. Unable to overcome Raven's hack and on Jaha's suggestion, A.L.I.E. sends the consciousness of Monty Green's mother Hannah to distract them. Monty reluctantly deletes his mother from the City of Light, but A.L.I.E. escapes both attempts at her destruction by fleeing to the Ark Ring in space where she is virtually untouchable. However, the hack reveals to Raven that the AI has a secret weakness: a hidden kill switch that will destroy her if it's activated.
With no other choice, Clarke and her friends decide to use an EMP to free Ontari from A.L.I.E.'s control and use her to destroy the AI. Learning of this plan from the possessed Jasper, A.L.I.E. attempts to use him to stop the group at Arkadia, but Jasper is ultimately subdued. Clarke is captured in Polis and Jaha and A.L.I.E. threaten the life of her mother in an effort to get her to turn over the Flame. When Clarke's friends get too close, the AI orders Jaha to kill Ontari which he does by smashing her head in. Although Jaha is interrupted before he can finish the job, Ontari is left brain dead and unable to help them.
With no other choice, Clarke uses the EMP to free her mother instead in order to have Abby use a continuous exchange transfusion to give Clarke Ontari's Nightblood. With Ontari's blood pumping through her veins, Clarke intends to take the Flame herself in order to destroy A.L.I.E. once and for all despite it risking her life. As the AI's army of possessed followers scale the tower, Clarke's friends fight to hold them off and Clarke takes the Flame and then the chip that sends her into the City of Light in order to reach A.L.I.E.'s kill switch.
In the City of Light, Clarke is protected by the Flame from immediate detection while Raven begins hacking into the AI again in an effort to help. However, the people in the City start to become aware of her presence and attack Clarke, causing her to subconsciously summon the mind of Lexa out of the Flame to help her. With the help of Lexa, various signs and hacking from Raven, Clarke is able to reach A.L.I.E.'s kill switch in a replica of the lab on the Polaris space station.
Before Clarke, joined by the consciousness of Becca herself, can pull the kill switch, A.L.I.E. appears to warn that destroying her will result in the destruction of the human race. The AI reveals that the nuclear reactors that survived the bombs are melting down and within six months, will render the planet uninhabitable for five years for anyone. A.L.I.E. had detected this four months before and it had prompted the AI's actions due to her belief that only through the City of Light could the human race survive. With her code updating due to the presence of the Flame, Clarke is left with very little time to decide whether to pull the kill switch or not before A.L.I.E. is able to delete it. Becca apologizes to her creation for not teaching her that the ends don't justify the means while Clarke suggests that A.L.I.E. can reveal the truth and give people a real choice instead as the AI predicts that the City of Light is the only chance. However, Becca warns that A.L.I.E. can't give people that choice because of her core programming and her belief that she is still doing the right thing.
Declaring that they will find another way like they always do, Clarke pulls A.L.I.E.'s kill switch at the last second. The AI is instantly destroyed, freeing her followers who were about to overwhelm Clarke's defenders in the real world.
Despite the trouble that A.L.I.E. caused, Clarke believes her claim about the coming second nuclear Armageddon and has Raven check out the AI's story. Using Arkadia's sensors and historical records, Raven is able to confirm that A.L.I.E. was in fact telling the truth and the human race begins making preparation to survive the coming disaster. The AI proves to be wrong about the timing, however, as Raven soon discovers that the death wave will come within two months instead of A.L.I.E.'s predicted six. Thanks to her warning, one-thousand and two hundred people are able to survive in a doomsday bunker beneath Polis while a small group retreats into space while the death wave scorches the planet bare except for one valley.
One major lasting effect of A.L.I.E. is that Raven, who displays continued heightened intelligence after being forcibly disconnected from the AI, begins suffering detrimental health effects that threaten her life with no apparent cure. As Raven's condition worsens, she begins hallucinating Becca Franko and as the death wave approaches, decides to go into space to die. However, a hallucination of Jacapo Sinclair, who was killed by Carl Emerson near the end of the war with A.L.I.E., convinces Raven to try to find a solution. As her condition is caused by remnants of A.L.I.E.'s code in her brain left over from being disconnected with an EMP, Raven effectively "reboots" her brain by rendering herself clinically dead for fifteen minutes and then reviving herself. This purges the AI's remaining code and returns Raven to normal.
One-hundred and thirty years after A.L.I.E.'s destruction, Clarke is mind wiped by Russell and Simone Lightbourne in order to resurrect their daughter Josephine in her body. Uniquely, Clarke survives the experience and encounters A.L.I.E. in her mind, surprising her due to the AI's destruction. A.L.I.E. reveals that due to Clarke connecting to the City of Light, a fragment of A.L.I.E. still exists inside of her mind. The AI had shielded Clarke's consciousness from the deletion and saved her life, but warns Clarke that if Josephine gets her hands on the memory of Clarke and her friends using an EMP to disconnect Raven, the Primes can remove that protection and get rid of Clarke for good. A.L.I.E. helps Clarke to protect the memory and Clarke thanks her, noting the irony of the AI helping to protect her memories when she had previously tried to get rid of people's memories while they were connected to the City of Light. A.L.I.E. defends herself that she was only trying to protect people from their pain and tells Clarke that those memories aren't even present with them as Clarke has buried them deep down.
The protection from A.L.I.E.'s fragment allows Clarke to fight back against Josephine and eventually kill her, regaining control of her body.
After her mother is mind wiped to resurrect Simone, Clarke attempts to discover if Abby has the same protection. However, Russell has confirmed that the EMP that had severed Abby's link to the AI had in fact destroyed any protection that she might've had.
- A.L.I.E. could be considered The 100's version of Skynet as they are both AIs that launched a nuclear Armageddon upon the world.