On the edge of the galaxy..

a sudden burst of energy happens and a rip in space appears. suddenly from this rip 30 ships come through into the galaxy. Anything from a light cruiser to a super carrier. once all of the ships are through the rip closes. one of the battlecruisers takes point as most ships take a defensive posture around where the rip was. Three construction ships begin immediately building a ring of some sort.

Aboard the lead ship the AEN Agamemnon.

a man who stands 6'3 enters the bridge and looks out among the stars. He looks to one of the crewmembers and begins to speak."Soldier have the rest of the fleet set up a defensive perimeter and scan for bogies on the radar. And have all fighter squadrons head 5 klicks outside main gun range."
"Yes sir!" The soldier replies and begins sending out the message via his headset. the tall man stands again looking at the stars and wondering about this new demension and wondering if it will yield any better than other places they have searched.