On this Thursday's Fringe, a 75,000-year old virus, meant to kill everything on earth, is unleashed on mankind.

That's always a problem.

Making matters worse, Peter contradicts the disease. Watch the official Fox promo for "What Lies Below" and then check out a few episode stills from the installment:

[video url="http://www.tvfanatic.com/videos/what-lies-below-promo/" title="What Lies Below Promo"] [/video]

As always, TV Fanatic will review and recap this Fringe episode after it concludes.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.