Many have joined Sam and Dean over the years! Welcome to MsMojo, and today we’re counting down our picks for the famous faces whose appearance on “Supernatural” may have slipped your mind like anything off of Dean’s Impala.

After nearly a decade and a half, there are a few things that need to happen before Supernatural ends. Before they carry on and we cry way more from saying goodbye, there is some unfinished business for the Winchesters to see to. It’s time to run through the scenarios, appearances and total fan service that we’d love to see on the longest-running American live-action fantasy TV series before the curtain closes on the 15th and final season. MsMojo ranks the things that need to happen before Supernatural ends. How do you want Supernatural to end? Let us know in the comments!