One morning in London, and every city and town in the world, the human race wakes up to the most surprising invasion yet: the trees have moved back in. Everywhere, in every land, a forest has grown overnight and taken back the Earth.
Missy works to score Reggie a membership in an exclusive country club that was founded by blacks, while Cam, in his search to support a church, gets a surprise from a pastor.
Near the dark and creepy canals of Xochimilco, Mexico sits what might be the world's strangest and scariest tourist attraction: the Island of the Dolls, also home to a sinister and haunted mystery.
On the fourth anniversary of his father's death, McGarrett meets a woman who helps him reopen the last unsolved case his dad worked on before he died.
Chase gets a girl interested in him, but Adam gets jealous and tries to ruin their date by having Chase turn back into Spike. Meanwhile, Leo and Bree suspect that Principal Perry has murdered a cook from the cafeteria and Donald. They then find out it was about a hamburger truck and they misunderstood everything.
When a classics scholar is stabbed to death and dumped in the Oxford Canal, Lewis, Hathaway and Maddox find themselves sorely tested by a bizarre case.
Gil John helps a former player become a war hero, and quickly regrets it. Robert hosts an engagement party for his latest matchmaking success, but isn't prepared for the surprise guest.
Todd and Jack struggle alone at McKinnon creek, working with just their old 400 excavator and a left behind loader, while Thurber transports their wash plant from Guyana to the claim. Tony nearly crushes his son beneath a conveyor, and Parker is forced to mine a swamp.
Gil John gets attacked by Sarah Palin and embraced by the media. Pressured by the party chair, Louis nudges Julie to consider a big wedding. Robert is forced to kiss up to his ex-wife's new beau, but gets some help from Rosalyn.
The survivors struggle to recover from a shocking death and in Kansas they happen upon a gun show that makes the zombie apocalypse look calm.
As the election returns come in, Gil John meets with a presidential campaign advisor, while Robert wonders if he still has a job. Katherine and Julie discover their wedding has been turned into a major political event -- after they arrive.
While the young airbenders look far and wide for Korra, Ikki is briefly captured by two Earth Empire soldiers. Based on what they say, Ikki leads the trio to the swamp. There, Korra is still haunted by visions of being hurt by her past enemies, but manages to connect to the siblings through the great banyan-grove tree's roots. After they beg her to resume her Avatar duties to face Kuvira, Toph's advice helps Korra to let go of her fears, bend the rest of the poison out of herself and re-enter the Avatar State.
Lee's big mouth has got him and Lucy invited to a christening party thrown by new neighbours Toby and Anna, and now they have no time to find the perfect present for the baby who has everything.
Gil John tries to right things after the Watts brothers Swift Boat his former player. Julie shocks Louis and Louise by announcing she's pregnant from an anonymous donor, while Adriana confronts Marta the housekeeper about Andy. Louis tries to debate Penn Jillette, but he's no match for what the magician has up his sleeves.
Chuck and Mike debate the merits of an inner city school merging with a high school in an upscale neighborhood; Boyd's Halloween costume -- a lump of coal -- reminds Vanessa of her job's potential impact on the environment.
Gil John finally breaks through to daughter Cee, then gets a lesson in civility from the women's caucus. Andy heads to Miami to try and win back Adriana, and gets some insights into his condition from a therapist. Meanwhile, Robert ignores his advisors and helps register black voters.
Gil John pays a visit to the Watt brothers, Louis worries when an old college friend threatens to share stories, and Andy tries to talk his way out of Gaffergate, only to learn he's got bigger image problems.