Supernatural Cast: Where Are They Now?

Though he also played Belphegor, Alexander Calvert's biggest claim to fame on Supernatural is for his stupendous work as Jack Kline, the son of Lucifer.

This is the role that put the Canadian actor on the map. Prior to this, the majority of his roles were either one-off appearances in various television series' or straight-to-television movies that remain largely unknown to the common viewer. He did, however, have a reoccurring role as Lonnie Machin on Arrow that lasted a combined five episodes.

As Jack Kline, Calvert delivered a breakthrough performance, rising to prominence for his engaging and believable performances across the 39 episodes he starred in.

It's unfortunate news, then, that Calvert has just one credential to his name post-Supernatural. He'll play Thomas The Cat King in Dead Boy Detectives, also starring fellow Supernatural alum Ruth Connell, which is currently in the middle of production. It's unknown when, exactly, this will air.

Although he doesn't appear to have any other acting gigs lined up at the moment, Alexander Calvert has got a solid Instagram account for his cat, Lord Tyrion, so it's not all bad news for the 31-year-old.