Here’s how TNT describes the episode, which is called “Brazil.”
When the 2nd Mass destroys a crucial Espheni base, a relentless enemy is taken down and the Mason family is reunited with those who had been lost. But the arrival of more interstellar players puts the fate of the Earth’s remaining survivors in doubt. Robert Sean Leonard guest stars.
Greg Beeman directed the episode which is written by Remi Aubuchon. Here are some images that TNT has released from the finale:
