Below is a gallery of promotional pictures from this Thursday's coming episode of Grey's Anatomy, "Holidaze." Thanksgiving, Christmas and New Year's pass and several characters are confronted with people they least expect - chiefly Mark, and his possible daughter (?!).

Meanwhile, Thatcher Grey returns and with him comes the usual drama. This time, he's calling out Richard. Also, Miranda is visited by her father, who we've never before seen.

Click to enlarge some photos from "Holidaze" and tell us what you think we can expect in this holiday-themed episode. Follow the jump for lots more pics, too (there are a ton):

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