'Supernatural’ Could Have Had a Very Different Co-Star Alongside Sam and Dean

"Supernatural" almost featured a different co-star alongside Sam and Dean Winchester.

Originally, creator Eric Kripke envisioned a character named "Cassie,"  

who would have been a love interest for Sam and a potential ally for the brothers in their fight against supernatural threats. V8,

However, this idea was ultimately scrapped, and the character of Cassie was reworked into Cassie Robinson, who appeared in Season 1,  

Episode 13, titled "Route 666." Played by Megalyn Echikunwoke,  

Cassie Robinson was Sam's ex-girlfriend and helped the brothers in a case involving a haunted truck.