Grey's Anatomy has been on for 13 seasons — that's three short of ER and one more than Supernatural. Over the course of those many, many episodes, we've seen a ton of memorable guest stars pass through the hospital doors. Some big names even had longer arcs on the show, but we wouldn't blame you for forgetting about them. After all, so much happens on the series. With the season 11 finale rapidly approaching, we thought we'd take stock of who has appeared on the series over the years. Check it out, and when you're done, sob to these infamous Grey's Anatomy hits.
34 Actors You Forgot Were on Grey's Anatomy
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