Haven will have some exciting guest stars through the end of season 5.

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The supersized 26-episode season brought in some well-known names for season 5A, and fans will be treated to even more familiar faces during 2015.

On the returning side, viewers will continue to see appearances from Dr. Cross (Laura Mennell) and Jay Reso's McHugh (set to first appear in "Chemistry"). Meanwhile, the Trouble town will get a third visit from the Darkside Seekers, throwing Kris Lemche's Seth Byrne back into the fray.

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As for the newbies, TV Line confirmed that viewers can expect to see Star Trek's William Shatner and Reign's Rossif Sutherland. Neither of these characters have official names as of yet, although it is rumored that Sutherland's Haven addition may be called The Sandman.

It is currently unknown how long Sutherland will stick around Haven, but fans will be treated to a four-episode arc from Shatner.

Find out more when Haven airs Fridays at 7 p.m. ET on Syfy. Click the video below to see a preview for the series' next episode, "Chemistry."

Tags: Haven television Syfy