Revelation

 is the fourth episode of the second season of Under the Dome.

Synopsis
With Big Jim on board Rebecca pushes ahead with the plan to reduce the population. By keeping track of the local farmers' livestock Rebecca discovers a pig that died from the flu and gets blood from the carcass to cultivate the virus at a lab. When it is ready, and liking the idea of using natural selection and letting the virus do the dirty work, Big Jim heads to the diner to contaminate some water. Julia and Sam are also checking farms and find not just the one dead pig but many more. Julia connects the deaths to Rebecca's plans and believes that the diner will be the contamination point. They go there and stop Big Jim but he doesn't have the virus. Rebecca didn't trust him and she takes the virus to the church where many people are gathered. Before she can put it in the font water she finds that more pigs have died and believes this to be a mutation that is much more lethal so she doesn't contaminate the water. Both Big Jim and Rebecca get locked up in jail. Junior lets Lyle out of jail. Lyle shows Junior postcards he had received from Pauline since helping her fake her death. The postcards displayed the events that had happened since the dome came down but stopped at the blood rain. They go to Sam's cabin looking for Pauline's journal. Lyle hits Junior, takes the journal and leaves. When Barbie finds the three teens (Joe, Norrie, and Melanie) they tell him about the internet hot spot at the school and take him back there. They also explain about Melanie's locker and her picture in the old yearbook. They all begin looking through old newspaper files on microfiche and find an article about the disappearance of Melanie Cross. They go to her former home in town and then to a spot in the forest. Some of her memories come back. In 1988 she, Pauline, Lyle, and Sam found a meteorite with the egg. Melanie was pushed and killed. The group goes to Sam's cabin for an explanation and find Junior who says Lyle hit him. Barbie goes to talk to Julia at her house but she is still mad at him so he leaves. Sam is there and tries to kiss Julia but she backs off. Sam is shown with scratches on his right shoulder, possibly from Angie.