I'll try to post these every other week day (Mon-Wed-Fri), but I make no guarantees. Sometimes there will be more than one cap for a beginning or ending of an episode. I'm also using my capper's discretion - meaning I'm choosing the most aesthetically pleasing image that we see first or last not always literally the first or last things we see. I'll explain this as we go along.
:: Click on images for the HQ versions ::
4.18 Beginning: This episode opens with our first look at Chuck Shurley asleep on his sofa quickly followed by the boys entering a comic book shop where they'll find out there's a series of books called Supernatural which just happen to document their lives.
4.18 Ending: By episode's end Lilith has been thwarted and Sam is thankfully still alive. We end up back at Chuck's house where he wakes up from another dream to find Zachariah asking, "Did you see it?". Chuck did and he wants to warn Sam & Dean but Zach stops him from doing that & warns agains trying to kill himself because they'll just bring him back.
Chuck: What am I supposed to do?
Zachariah: What you always do. Write.