Commander Shepard found himself in command of six alien hunters from a neighboring parallel universe. Now, he has the new responsibility of trying to keep the XCOM operatives in his squad from tearing the Normandy crew apart with either rampant xenophobia, or just by plain old poor communication skills. Starts from ME2's Freedom's Progress. Ends in Collector Base? Not necessarily.
After a ship-raiding mission gone awry, a military strike team from an alternate, technologically-advanced 20th century found themselves hurled into a universe unlike any other. Now, they must find a way to return to the war back home, while trying to prevent another war from happening entirely. Meanwhile, a group of champions find themselves in slightly different circumstances.