The mysterious Dr. Jekyll serial killer hasn't shown up lately on CSI, but the show's producers haven't forgotten about him — and neither has Ray Langston.

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Conveniently, on Thursday's episode (9/8c, CBS), "Neverland," Langston (Laurence Fishburne) comes across a familiar name: Nate Haskell. "It's just a little callback to him, which is kind of eerie and could be a sign of things to come," Tom Mularz, who wrote the episode, tells TVGuide.com.

Haskell (Bill Irwin), of course, is better known as the Dick & Jane killer, who was first introduced in the Season 9 episodes that brought Langston onto the team. Executive producer Carol Mendelsohn says Haskell may have a connection to Dr. Jekyll, which reinvigorates Langston through the rest of the season in his hunt to bring Jekyll down.Mega Buzz: Get scoop on a kiss for CSI's Catherine

Meanwhile, the rest of the team links a young boy's murder to an old case. "Part of the story deals with a case that Sara (Jorja Fox) handled before leaving for Costa Rica. It was one of the things that kind of frustrated her to the point of wanting to leave," Mularz says, adding that it's interesting for Langston to see someone share his passion about closing a case. "Langston, who joined the team after that, has really only known her as Mrs. Grissom. So he gets a glimpse of the fire that still lingers around some of these cases in her mind."