‘Supernatural’ Season 15 Finale Spoilers, Live Stream: Watch Online End Of Sam, Dean’s Journey

"Supernatural" Season 15, Episode 20 airing Thursday marks the end of the long-running sci-fi series. The series finale titled "Carry On" features Sam and Dean Winchester’s “final ride” of their ghost and demon hunting career.

Last week’s penultimate episode, "Inherit The Earth," featured the final battle between Chuck/God and the Winchester brothers. Sam and Dean succeeded in trapping Chuck, replacing God, and finally saving Earth. The new God restored the world to normal and the brothers rode in their 1967 Chevy Impala to start a new journey.

With the divisive battle coming to an end and so many complicated stories closing out, fans would agree that episode 19 felt like a finale. However, there is one last story remaining to tell.

“It's the final ride for saving people and hunting things, as the longest-running sci-fi series in the US comes to an end after 15 seasons,” teases the official synopsis.

When "Supernatural" Season 15 returns this week for its final chapter, the show will tell a very “personal story” about Sam and Dean in an episode that will prove to be a real tearjerker. Speaking with Entertainment Weekly, the series boss Robert Singer, who also directed the “Supernatural” finale, revealed what the conclusive episode will be like.

"I think [co-showrunner] Andrew [Dabb] had written a really good script. It's a very emotional episode. It's a personal story, really, about the boys. The season myth really ends at [episode] 19 and this is a bit of a coda to that. It's really an actors' episode. The guys are great in it,” Singer said in the interview.

There is not a lot in the promo that reveals where the Supernatural finale takes Jared Padalecki and Jensen Ackles’ characters. Fans are assured that the two-hour finale will unravel “how it all started” and “how it all ends.” Meanwhile, executive producer Andrew Dabb promised fans that the brothers will not end up separated.

“Sam and Dean started this journey together, and they are ending this journey together," Dabb told TV Line.

Episode 20 "Carry On" will be accompanied by a celebratory episode featuring some memorable moments and cast interviews from Padalecki, Ackles, Misha Collins, and Alexander Calvert. Showrunners Dabb, Singer, and others will also make an appearance.

Fans can watch "Supernatural" Season 15 Episode 20 online via streaming on The CW app and The CW website on Friday morning. Tuning in to the live streaming platform Hulu Live TV with an active subscription will enable fans to watch the conclusive chapter of the series.

Supernatural Season 15 finale airs Thursday, 8 p.m. ET on The CW.