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Joshua Jackson

Steve Granitz/WireImage.com

All that jumping back and forth between parallel universes apparently had an adverse effect on this Fringe star.

Joshua Jackson was rushed to a hospital in Santa Monica Thursday night after he came down with a bad allergic reaction, E! News has confirmed.

So, what went down?

"[He had an] Allergic reaction, that's it. He's perfectly fine," Jackson's rep told E! News.

While no further details were given on what set off the reaction, Fringe fans can breathe a sigh of relief since Jackson reportedly checked out of the hospital later that evening accompanied by galpal Diane Kruger.

Whew.