First mentioned way back in Season 1, The Slutty Pumpkin has been a 'How I Met Your Mother' legend. Ted (Josh Radnor) met Naomi (Katie Holmes) at a Halloween party in 2001, but lost her number and has spent years waiting for her. Now she's back ... and very affectionate.
Here's how CBS describes the episode: "'The Slutty Pumpkin Returns' (Mon., Oct. 31, 8PM ET) -- Ted finally meets his mystery girl in the Slutty Pumpkin costume. Meanwhile, Barney learns he is part Canadian, and Lily has pregnancy brain."
Check out videos and photos of Holmes as The Slutty Pumpkin below!