What's more awkward than going to your high school reunion? Going to your high school reunion with your boss. That's what happens on tonight's 30 Rock, when Jack persuades Liz to go to her reunion — and then tags along for the ride.

It's a fairly serious episode by 30 Rock standards, which mostly just means it's depressing-funny rather than goofy-funny — all the usual little asides and one-liners are still there, and I've been using a few of them in my daily life ever since I first saw the episode last week. We get to see what Liz was like in high school, which is hilarious for a number of reasons, most of which would be too spoilery to reveal. And there's some good, meaty Jack stuff, as Don Geiss awakens from his coma to determine Jack's future with GE.

And yes, this is the episode that was supposed to have a couple of Gossip Girls as guest stars. Sadly, that never came to be — but Blake Lively's sister, Robyn Lively, does turn up as Liz's old high school nemesis (though you might not recognize her under her awful wig — she's on the right in the picture above). To check out a preview for the episode, just read more.

Photo courtesy of NBC