Eureka took One Small Step last week.

This Monday? It's time for One Giant Leap.

That's the title of the summer finale, as Syfy warns fans in its official synopsis that "chaos" is on the way "when an energy beam rips through main street" of Eureka. Still, whether or not the town is intact,  the Astraues launch must commence. Check out the trailer now and visit TV Fanatic for a detailed review as soon as the episode ends:

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