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(Episode 413) "Sanctuary For None (Part 2)"
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- With the new Abnormal Homeland now openly under threat, Helen Magnus is forced into a corner - but she has a plan in mind that no one sees coming.
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(Episode 412) "Sanctuary For None (Part 1)"
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- Caleb, a notorious leader in Hollow Earth, asks for Helen Magnus’ help to build a new home for displaced insurgents on the surface. But will the world's governments allow that to happen without sending in the troops?
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(Episode 411) "The Depths"
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- Racing to stop a SCIU team from capturing an extremely rare and legendary Abnormal, Magnus and Will get trapped in a cave-in.
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(Episode 410) "Acolyte"
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- Trouble from Hollow Earth insurgents leads to a reunion with a dear Sanctuary friend, and an unanticipated betrayal.
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(Episode 409) "Chimera"
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- Magnus and Nikola Tesla become trapped in a virtual Sanctuary world at the mercy of the evil avatar of Adam Worth.
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(Episode 408) "Fugue"
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- A mysterious Abnormal attacks Abby, and Magnus and Will discover that there's only one way to communicate with this unusual enemy - through music. Music and lyrics by series creator Damian Kindler and composer Andrew Lockington.
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(Episode 407) "Icebreaker"
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- When a team from the UK Sanctuary gets in trouble on a stranded icebreaker in the Bering Sea, Magnus and Will must figure out who is behind the mysterious happenings at sea.
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(Episode 406) "Homecoming"
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- Will runs into unexpected trouble, and personal revelations, on a trip to the Liberian Sanctuary in Monrovia. Meanwhile, Magnus has her hands full when a couple of ne'er-do-well flying Abnormals recruit her help with a questionable scheme. Directorial debut of series co-star Robin Dunne.
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(Episode 405) "Resistance"
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- A Sanctuary mission to infiltrate a secret Abnormal testing facility brings Magnus and Henry face-to-face with a mysterious and deadly creature, and with an old friend whose loyalties are once again in question.
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(Episode 404) "Monsoon"
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- Magnus flies to a remote island in Africa to meet with the Sanctuary's new top secret financial advisor, but lands herself in the middle of a deadly hostage situation.
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(Episode 403) "Untouchable"
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- With a government inspector threatening to cut off the Sanctuary's funding, Magnus and Will must explain a mission gone wrong. Meanwhile, Henry has a surprise visitor with some shocking news.
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(Episode 402) "Uprising"
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- As Hollow Earth Abnormals continue to arrive at the surface in droves, Will, Henry, Kate and Bigfoot scramble to prevent all-out war with the Lotus Security Forces. All the while, they are worrying about the whereabouts and safety of Magnus who was last seen heading to Praxis just before the city was destroyed.
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(Episode 401) "Tempus"
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- In the season four opener, Helen Magnus has pursued Adam Worth back to 1898 London to stop him from altering - and quite possibly completely destroying - the future.
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