Supernatural's Spinoff Confirmed the Universe's Greatest Hero by Paying Off a 13-Year-Old Tease (& It's Not Sam or Dean Winchester)

Supernaturalfollows monster-hunter brothers Sam and Dean Winchester as they save each other and the world. As the series progresses, others, including Castiel, join the Winchester family, but another main character has been there from the very beginning: their Chevy Impala.