First run of Xeno Dead Zone. I played solo with one each of the nine pregens. I used the XDZ rules and statted them out. They did fine, just fine, until the xenos hit.
Not a single objective completed. I spawned an average of 12 xenos per round. Got Out of Ammo on the second round, which pretty much sealed their fate. Then came Scent of Blood, and 30-50 wild xenos stampeded down the hall. They managed to seal a door in the nick of time.
But all for naught. Although they got a much-needed Supply Drop, it took them too long to get the door to the Alpha open. 9 xenos spawned on their heads, and it was game over, man.