This is the third mission in the Starcraft II: Wings of Liberty single player.  It’s titled Zero Hour.  You must hold out 20 minutes until extraction.  In the meantime, the Zerg has arrived lured somehow by the Xel’Naga artifact.  At the end of the 20 minutes, Captain Matt Horner arrives aboard the Hyperion battlecruiser to rescue Jim Raynor, Tychus Findlay and the Raynor’s Raiders.

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