A forensic psychiatrist is on the trail of an odd boy who left a crime scene, and comes upon a doctor with a strange proposition.

A forensic psychiatrist is on the trail of an odd boy who left a crime scene, and comes upon a doctor with a strange proposition.

Helen, Ashley and Will release three women from a crypt while in Scotland and return them to the Sanctuary.

Helen and Will are led to a unusual ring of criminals during a probe of strange robberies.

While on a return flight from the Himalayas, Will and Helen's plane crashes leaving them stranded on an island.

The investigation into the three women found in the crypt continues, confirming Magnus' theory that they are much more than they appear. Ashley's hunt for contraband creatures yields mixed results.

Will falls victim to the three women's growing powers, while Magnus seeks proof of their true identities via a former resident of the Sanctuary. Ashley's luck in her monster hunt begins to run out.

Magnus, Will and Bigfoot defend the Sanctuary against a deadly assault, while Ashley struggles to survive her encounter with a nearly unbeatable foe.

Mangus and Will's underwater mission goes awry when their submarine nears the Bermuda Triangle.

While tracking down a missing friend from his college days, Will discovers a secret fight club where it's a fight to the finish.

The team tracks a rare and dangerous creature while a news crew is watching them.

In part 1, the Cabel and the release of the pathogen are linked which causes humans to be attacked by abnormals, prompting Mangus to seek out the remaining members of The Five.

In the season finale, Magnus goes on an action packed journey to find the secret labyrinth in the decimated city of Bhalasaam. Elsewhere, Henry and Ashley are held captive by the Cabal.