A priest gives a girl last rites in a hospital as her mother cries at her bedside.
The doctor checks with the mom then turns off the machines. She pronounces the girl dead and they prepare to harvest her organs.
In the OR a doctor cuts the girl open and begins removing organs, but the girl wakes up, grabs his hand and sits up on the table. She starts repeating a string of numbers and letters: 68339 Alpha Echo 358
The Fringies arrive at Boston General Hospital. The girl is Lisa Donovan, a high school junior. She went into a coma a week ago following an aneurysm and was pronounced brain dead.
A Lt. Commander from the Navy greets the Fringies. The doctor was a former navy man and recognized the numbers as code. The first half goes a petty officer Andrew Rusk, the second half to launch codes from a nuclear submarine he was stationed on.
Rusk went missing three days ago. They've found no contact between Lisa and Rusk.
Olivia (Anna Torv
) talks to Lisa, who has no idea where the numbers came from. Olivia says Andrew Rusk's name and she suddenly starts speaking Russian. And she doesn't speak Russian.
Turns out Rusk is fluent in Russian. Peter (Joshua Jackson
) recognized the phrase "my little star."
They realize Walter (John Noble
) has wandered off. Peter finds his dad "listening" to a woman in a coma.
Walter thinks Lisa's spirit might have eavesdropped on Rusk when she was dead. Peter is, understandably, somewhat incredulous.
Lisa's mom tells Olivia the doctors have no idea what's wrong with her daughter and she has a fever. She clutches the cross around her neck and says God gave her daughter back.
Olivia asks if Walter can examine Lisa. She thinks it might help Lisa and help them find Andrew Rusk.
Cut to Lisa in the bathroom, splashing water on her face. She looks up and sees a man standing behind her. She screams and when her mom and Olivia come running she says it was Rusk.
Boston Federal Building
Charlie (Kirk Acevedo
) sighting at FBI HQ (note: Fox calls this a "special unearthed episode from season one.") Theresa Rusk (Annie Parisse) is there to talk to Olivia.
Olivia repeats the Russian phrase to Theresa, who recognizes it as the pet name her husband calls her.
Walter explains Lisa's aneurysm was in a part of the brain dealing with speech. They watch an old tape of young Walter experimenting on some dude's brain to prove that electrical stimulation could make someone psychic. He thinks Lisa's aneurysm made her psychic. He wants to examine her, but mom Maureen won't let him.
Olivia finds Lisa and her mom as they leave church. She tells them their psychic theory. Mom shuts her down (and The Observer walks behind Olivia). Olivia gives the mom her card, but mom just wants Lisa to put everything behind her.
At the lab, Olivia gets a call from a crying Lisa Donovan. She says she keeps seeing Rusk and the place she's in now.
Peter and Olivia head to a salvage yard and find her. She says Rusk was there and another man killed him. She didn't see the killer's face. Peter finds a shell casing.
Later, Charlie and Olivia check out the body of Rusk in a trunk. Lisa screams and Olivia runs to see her seizing.
Back at the hospital, Olivia relays to the Bishops the ME says Rusk was killed three days ago between 5 and 7 a.m.
The doctor tells Lisa's mom and the young priest Lisa's seizure had nothing to do with her aneurysm.
Walter checks with the mom on what time Lisa came back to life. He tells Olivia his theory they died at the same time and Rusk's death is what brought Lisa back. The priest overhears and calls it absurd. The priest hears this as Lisa being possessed. Walter starts to go on an church-science diatribe when her mom asks him if he can help Lisa.
He wants her transferred to his lab. Privately he tells Olivia and Peter he thinks Rusk's energy transferred his memories to her but he has no idea why Lisa is sick.
Olivia wonders if Rusk being sick could make Lisa sick. There was nothing in the files, but that doesn't stop Olivia.
She talks to the Lt. Commander and tricks him into admitting Rusk was sick. He tells her Rusk was exposed to radiation for 16 hours in the sub following an accident then given a highly experimental radiation inhibitor. He's been on medical leave for six months. Olivia asks for the real records.
Peter brings Walter the records in his lab. He thinks the radiation explains her problems. Walter thinks this calls for drugs, a sedative to unpry Rusk's memories from Lisa.
Lisa tells Peter how hard it's been to have kids treat her like a freak. Peter tells her, no worries, they're partial to freaks in the lab.
Olivia joins the fun and wonders if they can use Rusk's memories to find out who killed him.
Walter begins his combination of mind altering drugs. Olivia asks her to think about Rusk. The brain waves spike on the scan and Lisa starts writhing on the gurney and talking like a dude. Meet Andrew Rusk.
Walter realizes this means Rusk's entire consciousness was transferred to Lisa. Walter tells her mom it's too late to stop the experiment. He thinks Lisa has merely been "supressed."
Astrid (Jasika Nicole
) takes mom Donovan outside. Olivia talks to Andrew/Lisa asking who did this to him. She tells him there was someone in the backseat of his car who made him drive somewhere then made him get on his knees. He doesn't know his name. She says something about his blood and left arm.
Olivia starts calling the local hospitals.
Later, Peter's there as Lisa comes out of Andrewland.
Charlie calls Olivia to tell him they found a guy with that injury, also navy, in counter terrorism. He works in a boxing gym. Charlie and Olivia go to find him there. He runs as soon as he sees them.
After a healthy foot chase, Charlie tackles him.
Back in the lab, Lisa has found the dead body of Andrew Rusk. Peter drags her away but she gets rid of him by asking for a drink.
Peter roots around in the fridge as Walter examines the brainscan results. He says it looks like Lisa is still being masked by Rusk. Peter goes back to look for her, but she's gone.
Charlie and Olivia interrogate their suspect. They ask who ordered him to kill Rusk. He says Rusk deserved it, for what he did to his wife.
He says he met Theresa Rusk at the bar where she works and she told him Andrew was beating her. She hired him to kill Rusk. He says before he shot Rusk he told him it was courtesy of his wife. As he's saying this, we see shots of Lisa using a spare key to get into Rusk's house and get a gun out of safe.
Theresa comes home to see a teenage Lisa in her house, with her gun.
Olivia and Peter compare notes and race to Theresa's house.
Lisa ties Theresa up and douses her with gas. She's holding a match over Theresa when Peter walks in. She turns the gun on Peter. He stalls for time, talking to Lisa about how hard it is in high school to be different. She's about to pull the trigger when Charlie comes in the back and hits her with a tranquilizer dart.
Later, she's wheeled into an ambulance as Olivia tells her they'll see her later at the lab.
In the lab, Walter examines the brain scan and sees only one set of waves. He pronounces Rusk gone. Her mom asks how they can be sure. Walter quotes her Latin, "unless you believe, you cannot understand," and tells her sometimes faith is called for.
Lisa hugs everyone good-bye, telling Olivia she'll be 18 in a year, she shouldn't wait too long to make her move on Peter.
Olivia reports to the Bishops the navy declined to let them open an investigation into the submarine accident. Walter doesn't think they'll have any more consciousness transfers.
Cut to a man waking up with a serious head wound in a traffic accident -- speaking Russian.