The 2nd Mass prepares to take the fight to the invaders with an assault on one of their bases. But Weaver’s increasingly strange behavior worries Tom that he might not be fit to command. Hal and Tom encounter a left-behind woman who employed a suspicious means of surviving the invasion, making it unclear whether they can trust her.

The FDLE enters the battle between good and evil when a Pentecostal preacher is found dead in a snake pit. Longworth's investigation into the House of God eventually leads him to the Big House and a fatal case of mistaken identity. Meanwhile, Sam's departure has Callie questioning her own relationship with Longworth.

Jeremy Clarkson and James May set out for the seaside in a pair of electric cars, the Nissan Leaf and the Peugeot iOn, stopping off in Lincoln along the way. Richard Hammond meets an extraordinary rally team in which everyone is an amputee with a military background, and finally the new Lamborghini Aventador is taken out on the track.