bit of correction. Episode 4 is entitled Metamorphosis (kinda boring episode, but links to how Sam will in the end treat his psychic powers) and Episode 5 will be Monster Movie.
anyhows, somebody uploaded the episode guide over at wikipedia
http://en.wikipedia.org/wiki/Supernatural_(season_4)
1 "Lazarus Rising" Eric Kripke Kim Manners 3.96[1] September 18, 2008
It's four months later and Dean wakes in a pine box. He's been freed from Hell. He has a joyful reunion with Sam and Bobby, but it isn't long before the three wonder what exactly pulled Dean from Hell and what it will want in return.
2 "Are you there, God? It's me, Dean Winchester" Sera Gamble Phil Sgriccia 3.18 September 25, 2008
Sam, Dean and Bobby are being haunted by the angry spirits of people they couldn't save. Bobby becomes emotionally disabled when the ghosts of two young girls, he couldn't save begin to haunt him. Dean and Sam think they are going crazy when the ghost of FBI agent Victor Henrickson (Charles M Whitfield) and Meg Masters (Nicki Aycox) appear and accuse the boys of failing them. At the end of the episode Castiel reveals that the ghosts rising is one of many signs of a coming apocalypse where Lucifer will walk the earth.
3 "In the Beginning" Jeremy Carver Steve Boyum 3.51 October 2, 2008
Dean is transported back in time to Lawrence, Kansas where it is the 70's. There, he meets the younger John Winchester (Matthew Cohen) and Mary (Amy Gumenick). This family reunion gets bigger when the Dean meets their Grandfather (Mitch Pileggi), who could have a huge secret.
4 "Metamorphosis" Cathryn Humphris Kim Manners 3.15 October 9, 2008
Sam and Dean encounter a man who seems to be turning into a monstrous creature.
5 "Monster Movie" Ben Edlund Robert Singer October 16, 2008
Once again, the brothers encounter a shapeshifter. But this Shapeshifter is much different than the other Shapeshifters they have encountered. This one likes to shift into monsters from 1930s horror movies. Sam and Dean come up against Dracula, Wolf Man, The Mummy and even the creature from the Black Lagoon.
6 "Phobia (aka Yellow Fever)" Unknown Unknown October 23, 2008
The boys discover a town that is plagued with an illness that is similar to the Croatoan virus.
7 "It's The Great Pumpkin, Sam Winchester" Unknown Kim Manners October 30, 2008
The Winchesters find a coven that worships the Celtic demon Samhain. Sam manages to get on the bad side of two fallen angels in the process when he's told the job is meant for Dean and Dean alone but interferes anyway.
8 "Wishful Thinking" Unknown Unknown November 6, 2008
Sam and Dean encounter a man who collects old coins. But one of the man's coins might be able to grant wishes.
9 "I know what you did last Summer Part 1" Unknown Unknown November 13, 2008
Ruby goes to the crossroads to talk to the Crossroads demons replacement. We learn some of the events that happened to Sam while Dean was dead.
? "Afterschool Special" Unknown Unknown 2008
Sam and Dean find out that a spirit is haunting one of their old schools. Through flashbacks we see what school was like for the Winchesters.