James Callis

Syfy's hit series Eureka follows the interplay between the geniuses of a government think tank and their regular-guy sheriff. See Eureka's greatest moments, unforgettable characters and special effects in this exclusive retrospective.

The mysterious Julius Borden (James Callis), arrives in Camelot with news of a magical secret that threatens to change the landscape of the kingdom forever. He has located the final part of the key to the tomb of Ashkanar - an ancient mausoleum which holds a very special treasure: the last remaining dragon's egg. Merlin is understandably drawn in by Borden's news and promises to help him. But just who is the enigmatic stranger and more importantly, what does he really want with the egg?

See the characters from America's smartest little town like you've never seen them before, as you get ready for the all-new season of Syfy's original series, Eureka. And this year, "the equation has changed." Yes, Eureka is going through a major transformation, and as you'll see, its inhabitants might never be the same.

Demetri and Banks try to track down a killer; Mark reluctantly agrees to help Simon find his sister; the FBI discovers the identity of Suspect Zero. Also available on Xfinity, Netflix, Amazon Instant Video and iTunes

Olivia receives disturbing news from Gabriel; Aaron's life is in danger as he continues to search for his daughter in Afghanistan. Also available on Xfinity, Netflix, Amazon Instant Video and iTunes

Mark and his team search for Demetri. Also available on Xfinity, Netflix, Amazon Instant Video and iTunes

Demetri puts a rush on his wedding plans. Also available on Xfinity, Netflix, Amazon Instant Video and iTunes

Amita is abducted by a sociopathic guru known for manipulating his female followers. While Charlie searches for a motive, Don and his team scramble to locate Amita before her number's up. James Callis guest stars. Also available on Amazon Instant Video, iTunes and VUDU

Maneater: The town's air-conditioning system malfunctions, creating explosive situations. Meanwhile, Eureka's women develop a strange attraction to Sheriff Carter.

An experiment that will recreate the first moments of the origins of the universe - the "big bang" - goes terribly awry leaving the fate of Eureka in the hands of an antisocial uber-genius.

Noche de Suenos - Contagious dreaming turns the town upside down. We discover it's being caused in part by Allison and Stark, who are trying to determine her son Kevin's connection to the Artifact.

Duck Duck Goose: Eureka faces a threat from above when space debris accumulates into a massive cloud above the town and Sheriff Carter investigates in the hope of averting a disaster.