Ian Tracey

While Dean becomes obsessed with eliminating Dick Roman (JAMES PATRICK STUART), Sam helps a teenage girl (MADISON McLAUGHLIN) look for her father, a hunter who's gone missing. Also available on Xfinity, CW, Amazon Instant Video, iTunes and VUDU

Tesla and Magnus get warning signs that there's a sentient being in their computer system. Also available on Xfinity, Amazon Instant Video and VUDU

The season four premiere picks up where season three left off, with Helen Magnus (AMANDA TAPPING) standing on a cobblestone street, far from her own time or the modern Sanctuary resources. Having followed her longtime nemesis Adam Worth (IAN TRACEY) through a collapsing time vortex, she is stunned to realize they have both traveled back to London...1898. Worth is determined to change the course of his own history in order to save the life of his daughter -- even at the risk of destroying the entire future - and Magnus must track him down and stop him before he can make changes too large to remedy. Magnus' dear friend James Watson (PETER WINGFIELD), history's greatest detective and the inspiration for the fictional Sherlock Holmes, deduces the truth about her mission, and together they must find a way to stop Worth. But Victorian London contains unexpected pitfalls for modern-day Magnus, who's frustrated by the return to a time when so many doors were closed to her. Crossing paths with her own past self, and with her star-crossed lover John Druitt (CHRISTOPHER HEYERDAHL) -- otherwise known as Jack the Ripper -- Magnus is at constant risk of unintentionally altering the timeline. And with someone murdering women in Whitechapel again, a decade after the original Ripper killings, Magnus knows more than she wishes about both the future and the past. Also available on VUDU

The Sanctuary receives alarming news that a large group of Abnormals has been spotted at the entrance to a cave in South Dakota. As the video images come in, Magnus (AMANDA TAPPING) and the team know immediately that this is the first wave of Abnormals surfacing from Hollow Earth. Against Magnus's urging, General Villanova (TOM MCBEATH) of the Lotus Defense Corps and Lillian Lee (FRANCOISE YIP), Chief of the U.N. Security Team, move swiftly into military mode, assuming the worst and preparing to defend themselves against an aggressive attack. But Magnus knows that the Abnormals will need assistance and protection while they try to understand their reasons for coming to the surface. Also available on iTunes and VUDU