Two TV worlds will collide in the second episode of 'CSI: Las Vegas' season 15.

'Buzz Kill' will bring in 'Supernatural' actor, Richard Speight, as Lloyd Bryant, a medical marijuana clinic owner, according to Enstars.

"Yes, my CSI airs next week (glad I got a reminder tweet)," the actor, who played the playful angel 'Gabriel' in the CW series, tweeted on Monday.

Episode one endangered Finlay and also introduced the Gig Harbor Killer as well as the Winthorp twins (Mark-Paul Gosselaar).

According to the CSI Writer's Room, viewers will see the Gig Harbor Killer again on episode six as well as for the rest of the season.

"The #GigHarborKiller storyline will be revisited in episode 1506," the Writer's Room teased fans last Sunday.

Earlier in June, the Writers' Room had already teased fans of a recurring serial killer that will plague DB Russell and the rest of the CSI team.

"Hey, did you guys want to do a season-long killer this year?" The Writers' Room asked fans earlier in the summer.

Another tweet also read, "We're very excited about what we have planned for you this year. It's super dark and twisted."

Fans were later reassured that 'CSI: Las Vegas' season 15 will "not [be] painful at all! It will be a fun season (and dark), but not painful. Fun!!! :)"

What surprised the audience in the first episode, however, is how early the Gig Harbor Killer moved. He made Finlay sit on a bomb right off the bat and is willing to do more than that for the next episodes.

For now, however, fans will have to see Speight dish out drugs in 'CSI: Las Vegas' season 15 episode two.

Do you think he'll be as snarky as his archangel character Gabriel in 'Supernatural?'

In the mean time, watch a preview of 'Buzz Kill' below.