'Ghost Whisperer': A rebirth. From the sewer.
Melinda tells Delia that she doesn't think she loves Jim/Sam anymore because Jim had faith in her and Sam doesn't and she can't live without that. Melinda leaves to go pick something up at the store. Ominous thunder and lightning crash and none of the lights work. Spooky. I hope there's not a man with a hook for a hand in the Gorton's Fisherman outfit waiting for her.
Turns out there is a mechanic named Ben, not a ghost, in the store. At least, he's solid enough to knock over a vase. Melinda chases him (and she has the good sense to kick off her shoes) as he runs through a hole in the basement wall. Dr. Byrd then tells her there's "more where he came from. How safe do you feel now?" Creepsville.
It turns out Ben is a "step-in" like Jim/Sam. A man named Joseph stepped into Ben's body when he died and now Ben has all these old memories for Joseph's life. Dr. Byrd encouraged Joseph to do it because he is essentially running experiments on step-ins so that he himself can successfully become a step-in one day. Again: Dr. Byrd is the creepiest creeper who ever creeped.
Part of Ben's memories from Joseph's life include his wife Clarissa. He is essentially stalking her, so Melinda and Eli go to Ben's apartment to talk to him about it. At Ben's apartment, Melinda and Eli find the walls papered with names from Joseph's old life. They explain to Ben what has happened to him and how his memories are from Joseph. Melinda tells him they'll talk to Clarissa for him. Naturally, Clarissa is skeptical. Ben overhears her disbelief and runs off through the town tunnels, eventually bursting a pipe in a fit of rage and filling up the room in which he is trapped with fast-rising water.
Ben narrowly escapes through a hatch in the ceiling, but Melinda is not so lucky. She gets trapped on a catwalk as the water gets closer and closer. Dr. Byrd goes to get help from Eli, who happens to run into Jim. Jim is skeptical but he can't leave his damsel in distress so he jumps into the sewers to help Eli, who conveniently can't really swim. Jim takes a "leap of faith" to dive in after Melinda. Awwww. Gagggggg.
As he swims for her, all sorts of Jim's memories flash through his head. The swim seems to go on for like 5 minutes. I start to wonder if they show is just going to drown them both. The End. But no, Jim has a near drowning and when he emerges he wonders why Melinda keeps calling him Sam. Melinda tearfully hugs him and they climb out of the sewer together. Like the rebirth of their relationship. From the sewer. Romantic.
Melinda debriefs with Ben/Joseph about her reunion with Jim. He also thanks her for helping him make sense of his life and vows to start moving on with his life now. Dr. Byrd finally says he'll stop encouraging ghosts to commandeer other people's bodies, which is nice of him, and goes into the light.
Finally, Melinda, Delia, Ned and Eli take Jim home. Eli blathers on about rebirth (thief! I said it first!) and Melinda shows Jim his new visage (the dopey brother from "Jericho," which is unfortunate). He freaks a little but they cry and kiss and it's all sweet. Delia, Ned and Eli hug on the porch. Happy endings all around.