We begin season 4 with a car chase, and find out at the end of it that the person being chased is in fact Hurley:



At the end of this sequence, Hurley tries to resist arrest by shouting that he's one of the Oceanic six, implying that this was a flash forward. Hurley is then interviewed in a police station, where he has a vision of Charlie swimming up to the two-way mirror, and breaking the glass with his hand, on his hand it reads, "They need you":


Back on the island, Hurley and Bernard are chatting by the sea about going home:

Desmond arrives back, bearing the news that Charlie has died, and also that the freighter is not Penny's boat. They decide they must go find Jack and warn him:

Meanwhile, back at camp, Naomi has gone missing, and Ben won't say which way she went:

Flashforward, and Hurley is back in the mental hospital, playing Connect 4, when he receives a visitor, who asks him if 'they' are still alive. Note the drawings on the chalkboard:


Back on the island, Hurley gets lost in the forest, and stumbles on Jacob's cabin. Inside, he see Christian Shepherd, and an eye stares out at him:

Hurley runs for it, and encounters Locke. Together they decide to go and warn Jack about the freighter people. Meanwhile, Kate has been searching for the missing Naomi, she finds her, and Naomi lets the freighter people know that the Losties are not hostiles (despite being knifed in the back by Locke):

Everyone meets up, symbolically enough, at the fuselage wreckage, where Claire finds out about Charlie's death. Cut to a flashforward, and Hurley sees Charlie again, this time at the mental hospital. We discover that Hurley saw Charlie in a shop, which is why he freaked out and got into a car chase. Charlie tells Hurley that 'they need you', and Hurley tries to make him go away.

Back at the fuselage, Jack knocks Locke down, and tries to shoot him with an unloaded gun:

Owing to a few epic speeches from Hurley, the survivors split into two groups, one goes with Locke to the barracks for protection, the other stays with Jack to wait for the helicopter. Hurley, Swayer, Claire, Aaron, Ben, Alex, Karl and Rousseau go with Locke, and Juliet, Kate, Rose, Bernard, Sun, Jin and Desmond stay with Jack.
Flashforward, and Jack visits Hurley at the hospital. They play basketball together, and Jack asks whether Hurley will tell. Hurley doesn't answer. Hurley apologises for going with Locke, and is convinced they didn't do the right thing. Hurley says, "I think it wants us to come back, and it's going to do everything it can to..." Jack cuts him off and shouts, "We're never going back."

Back at the fuselage, Jack and Kate are at the fuselage, they see a helicopter spiral to the ground and a man parachute from it. The man removes his helmet and asks, "Are you Jack?" The end.
