“All the Rage” is episode three of season four of Eureka.
In the previous episode, “A New World”, the device which had transported everyone to and from 1947 fried, leaving them no choice but to stay in this alternate timeline.
Henry and Dr. Grant are still fiddling with the device, trying to see if they can get it working again, but they are hindered when Henry’s tools start disappearing when they touch them.
In Global Dynamics, an experiment goes slightly wrong (now, there’s a novelty!) and everyone starts becoming violently angry. Leading to scenes reminiscent of a zombie film, or maybe 28 Days Later.
There’s a new character introduced, played by Wil Wheaton, probably best known for his portrayal of Wesley Crusher in Star Trek: The Next Generation. He and Fargo do not get on with each other.