On last night's Gossip Girl, fans were treated to a vintage mix of scheming, plotting and undermining, not to mention a major walk down memory lane in the form of one of the CW drama's one-time core couples.

Sparks were flying with nods to Season 1 abound as we remembered some Dan-Serena moments past, while the duo took a big step toward reconciling and potentially ending the series as romantic partners once again.

Fan? Not a fan?

Opinions on Derena will surely vary, as they do with most things Gossip Girl. With just four episodes to go, we'll find out what the series endgame is for that couple - and others - in less than one month. Crazy.

Looking ahead to next week, Serena and Dan realize they need to make amends with the people they have wronged, while S teams up with B to help craft an "it" look for Sage that will win Eleanor's approval.

Elsewhere, Chuck is close to getting the evidence he needs against his father, until one of his closest allies reveals his plan to Bart. From the looks of the promo below, it doesn't look like it ends well for Chair.

Check out the teaser for "Save the Last Chance" and see what you think:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.