WARNING: If you don't want to know what happened in this episode, don't read this photo recap!
On their quest to find the thumbprint of the President of the United States, the gang heads to Mt. Weather, Virginia, where the government has gone to wait out the apocalypse. This is probably going to go how you imagine it to.
Turns out, the person they THINK is the President was eaten by his own secret service detail. So there's no thumbprint or even a hand. But it ALSO turns out that this dude is the President's husband, and they use his retinas to get into the facility.
Finally, after killing what's left of zombie Congress, the gang comes across the President, who knows her husband is dead and has two Secret Service agents, both named Agent Johnson. Also, turns out, the President has no thumbs.
Turns out, a few days prior, that creepy old dude from Zona turned up and took her thumbs. So, it turns out that they need the thumb of the President from when the apocalypse started: Bill Carney. He's a Zombie now and he's 25 levels down.
Before the team set off to find the President, they are shown a video about Black Rainbow and learn that it's an oldy-timey Cold War era weapon that rains down flesh-eating bacteria and rids the world of all people.
When Warren mentions that they'll be going off to stop Black Rainbow, the President turns on them and the Secret Service pull guns. As Commander in Chief, the President tells Sarge to assist Johnson and Johnson in taking Operation Bitemark prisoner. As Sarge says, she took an oath.