March 28, 1952: Lucy, Live on Stage

The curtains at the sides lend this strip an odd theatrical appearance.

The strip itself is another of those instances of Lucy pestering her father, who as we've noted before are reputed based on the childhood antics of Charles Schulz's daughter Lisa.

This may be the creepiest yet we've seen of Lucy's wide-eyed early look. In that first panel especially she looks like visions of Hell hold no secrets for her.

November 23, 1951: Patty & Violet Team Up

Violet's status as younger than Charlie Brown and Patty seems to have been abandoned. The two are starting to double-team him as well.

Can you believe that, at just over thirteen months of the strip in, we're over halfway through Peanuts' early period already? If you don't believe me, take a sneak peak at the strip that appears one year after this one. In the next year are introduced Lucy and LinuxLinus, and Snoopy starts getting thought balloons.

EDIT: Fixed the link. Thanks Zachary!