Next week on Grey's Anatomy, Derek lands the grant he needs for his clinical trial, but a surprise visitor shakes up what looks like a raucous night out celebrating at Joe's.

Who do you think that is? Someone new, or someone you just wouldn't expect to see at Joe's? See our photo gallery from the episode for many shots of the gang partying.

Meanwhile, Meredith and Alex are in a tough spot fending for themselves during the night shift. Here's the first ABC promo for the episode, "Slow Night, So Long" ...

Click here for a review of last night, then follow the jump for a Canadian promo for next week, which gives us a glimpse of some of the doctors' scandalous behavior:

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