Actress Jeri Ryan will appear on NCIS as Leroy Jethro Gibbs' second ex-wife in two months and it's expected to be a major event.

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"The fans are in store for some goodies," Emily Wickersham, who plays Ellie Bishop, told TVLine.com. "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."

The Helix actress recently signed on for the role as Rebecca and will first appear on the Jan. 6 episode titled "Check."

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"After 12 seasons there was still one ex-wife to cast opposite Gibbs and we found her in the beautiful and talented Jeri Ryan," executive producer Gary Glasberg said in a statement. "We're all very excited to have Jeri join us for a storyline that's chock full of surprises."

The actress also dyed her hair from blond to red in order to play the mysterious character.

"Becoming redhead as we speak... Stand by," Ryan tweeted on Nov. 6.

NCIS airs on Tuesdays at 8 p.m. ET on CBS.

Tags: NCIS