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Sanctuary: An original web based show turned primetime. Stars Amanda Tapping as Helen Magnus, scientist studying the extreme and Robin Dunne as Zimmerman the psychologist who people say sees too much.

Requiem is one of the episodes I had been waiting for the group to produce, it felt too short instead of shorted by TPTB. Ironically enough it is in the episode where the least amount of things happened that stands out as the most remarkable. It was neither a big budget nor a display of creatures that brought out the goodness of this episode. It all happened in a sub made from parts of the plane in the Kush episode.
This story starts out with Magnus pleading with will not to kill by flooding the room with CO2 and Will looking down at her through a window looking menacing. We cut back to the beginning of the trip with Magnus and Will out in the Bermuda Triangle investigating an incident with the merfolk. The resident Sanctuary mermaid, who Will named Sally since her name was impossible to pronounce, reported receiving strange messages from her people until communication ceased.
Will and Helen travel to the coordinates Henry traced the signal to only to find the remains of the merfolk, who appeared to have been decimated in an unknown conflict. During the ride Helen wows Will with her knowledge of many famous, and infamous, individuals from her past. They retrieve a fallen mermaid and take it to the sub’s lab, discovering an unknown clear fluid behind the deceased’s cranial wall. The pair prepare to head home to further study the specimen and are abruptly stopped by a sudden headache which incapacitates Magnus until they submerge further. Suffering extra-cranial bleeding from the headache and ascent, she heads back to the lab to analyze her blood. She prompts Will to ask more questions while they wait, he inquires about Ashley and Druitt, prompting her to leave the room.
They settle down in another room and Helen confides in Will that he is ready to continue her work if something happens to her. She starts bleeding again and they descend once again, afterward finding the blood work revealed nothing. Worried about dropping past crush depth, Will inquires how deep they can submerge before it gets dangerous. He is informed they have 8,000 more feet along with a day and a half worth of air. Will also remembers the clear fluid and asks Helen to expand the search, which locates “a microscopic parasite in the pyramidal tract” of her brain stem. This parasite is multiplying at an accelerated rate, in essence “taking over” Helen.  She scrambles to reexamine the mermaid in the lab to find that the parasite has destroyed much of its limbic system and logic center.
She sees that the parasite had slipped through tiny perforations in her gloves and that this entity was the cause for the destruction of the merfolk. Helen tries to expell the parasite by injecting herself with a cocktail of random drugs, but instead worsens her condition. She demands that they submerge further and when Will protests she attacks him and threatens to infect him with her blood, effectively persuading him. They plunge to danger depth and land on a shelf over the Puerto Rican trench. Helen flooded the ship to keep them submerging and ties up Will for a little bit, speaking to him from nutcase city before going to fix the issue so they can plummet into the depths more. Escaping his tethers and snagging the ships remote, they have a bit of a back and forth before we are treated to the opening scene where Will takes all the air out of the cabin she gets locked in and kills her.
Without a living host, the parasite oozes out of her and Will freezes it with some handy liquid nitrogen nearby. He then frantically tries to revive Helen, who eventually comes back to the land of the living. Will pleads not to be asked to kill her again, and they both agree that day was not meant to be the day Helen’s legacy passed onto Will.

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