There is an unexplained gap in Comic.com's archives over June 10-17. I should have a look in Fantagraphic's Peanuts compilations to see if strips are missing or if Peanuts was on hiatus during that period.
This is a vaguely creepy strip. If the eyes aren't Charlie Brown's, whose are they? And why is he hanging out in the sewer? My vote goes to a suburban Deep One. (That's right,
Peanuts and the Cthulhu Mythos, baby!)