Global Dynamics goes into lockdown to protect itself from the now airborne metal-eating bacteria. Stuck inside GD, Sheriff Carter and Stark must work together to save both the town and Kevin, Allison's son.

Eureka faces an inexplicable quandary when metal objects—and people too—begin turning to gold.

The women of Eureka become infatuated with Sheriff Carter, who they find irresistible.

A series of strange events causes Eureka's residents to worry that a biblical plague may be upon them.

Strange happenings and spreading radiation at Global Dynamics lead to speculations that an abandoned research project concerning invisibility might have been revived. When Sheriff Carter accidentally becomes involved, the effects of invisibility threaten his life.

As an experiment that will recreate the first moments of the origins of the universe, the "Big Bang", goes terribly awry, the town's geniuses turn into morons, leaving the fate of Eureka in the hands of Jack Carter and an antisocial young ubergenius.

Douglas Fargo's grandfather, Pierre, is accidentally awakened from his cryogenic slumber. However, Pierre makes it clear that he was not willingly "frozen".

The denizens of Eureka are experiencing shared dreams. What is considered humorous at first soon takes a dire turn for the worse.

Space debris threatens Eureka after it accumulates into a large cloud and Carter investigates in an effort to avert potential disaster.

After receiving a hit to the head, Carter finds that he is in a parallel Eureka where he discovers that its residents are mysteriously disappearing.

An isolated deep freeze trigger causes a chain reaction of sudden weather changes in Eureka.

Carter and Stark are forced to team up when Global Dynamics is threatened by an expanding personal force field.

Reorienting himself to the timeline restored in "Once in a Lifetime", Sheriff Carter investigates a series of sudden deaths.