In this special Halloween episode of the series, titled "Introduction to Statistics" (airing from 8-8:30PM ET), Jeff (Joel McHale) has the hots for his statistics professor and is determined to take her out on a date. He finds the perfect opportunity to pursue her, but it happens to interfere with a Day of the Dead party Annie (Allison Brie) is throwing for their Spanish class. Meanwhile, Pierce (Chevy Chase) comes to terms with being old. But of most importance to CBM readers, while Troy (Donald Glover) shows up as Eddie Murphy, Abed (Danny Pudi) transforms into the Dark Knight. Holy Halloween, Batman!