During season 4, Eureka experienced a blast from the past that sent the town through a worldwind of changes. Get caught up on the adventures here!
* Objects from 1947, like bullets, planes and redwoods, start appearing all over town. They realize that Dr. Grant is acting as a magnet for exotic particles, and causing these objects to be pulled through time.
* Allison engineers Nano robots to remove the exotic particles from Grant's bloodstream, shutting down his magnetism.
* Henry, after trying to put distance between himself and his new-timeline wife - Grace, yields to the fact that he's truly in love with her.
* One of the time-traveling objects got lodged in Jo's chest, and she is heartened by the fact that Zane sat at her bedside while she was recovering from surgery.
* Carter is crazy for Allison, but she starts dating Grant.
* Because of his love for her, Henry tells Grace about the time travel. She handles the news badly, and the two separate.
* Grant and Jack get into a scuffle with Carter over Allison, but the two band together to save Kevin, who is being hunted by Tiny, the astronautic probe.
* Carter uses quick wit to save Kevin, who then gives Jack his blessing to date his mom.
* Zoe is visiting from Harvard, and may be lighting up a romance with Zane. Jo is jealous, but there's nothing she can do to stop it.
* Archeologists at a local dig site are turning to stone. Carter and Zoe discover a bone treated with a solution that makes things fossilize is the cause.
* Zoe, having been exposed to the dig site, also begins to petrify, but they find the antidote to save her and the rest of the town.
* Realizing that life is short, Carter finds Allison and sweeps her up in a passionate kiss.
* Henry asks Fargo (of all people) for advice on how to win back Grace. Fargo's suggestion to serenade Grace with "She Blinded Me With Science" saves the day.
* Beverly Barlowe hatches a secret and sinister plan with Grant, who is unaware of the threat she poses to Eureka.
Wormholes start popping up all over, threatening to rip Eureka apart unless Carter can stop them.