NCIS will soon return from its brief hiatus with the anticipated episode featuring Gibbs' second ex-wife and executive producer Gary Glasberg teased some spoilers.

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When speaking with TVLine.com, Glasberg said the appearance of Rebecca Chase (Jeri Ryan) will be "unexpected, but welcome."

In the preview clip below - released on the NCIS YouTube page on Dec. 24 - Rebecca surprises Gibbs when she appears at a crime scene with his first ex-wife Diane (Melinda McGraw).

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"You see the different chemistry that he has with different women," Glasberg said.

Cast member Emily Wickersham, who plays Ellie Bishop, previously revealed to the website that it will be a special episode.

"The fans are in store for some goodies," she said. "We just finished shooting that episode, and it's a big deal for the team. And it'll be the same for the fans, a huge deal. It'll be an exciting one, for sure."

Aside from ex-wife drama, the "action-packed" upcoming episode will also explore the situation Sergei Mishnev, who is targeting Gibbs. The drama will "really come to a head" in February, Glasberg said.

NCIS returns with Jeri Ryan on Tuesday at 8 p.m. ET on CBS.

Tags: NCIS