Alex O'Loughlin, LL Cool J, Chris O'Donnell Alex O'Loughlin, LL Cool J, Chris O'Donnell

Chris O'Donnell and LL Cool J are about to get NCIS L-lei'd. The stars of NCIS: Los Angeles will say 'aloha' to the sexy actors of fellow CBS series Hawaii Five-0 as part of an exciting May sweeps two-night crossover event. The ambitious case involves the outbreak of a deadly virus that is quite possibly being used as a murder weapon. Yikes!

The sweeps stunt will begin on a Monday episode of Hawaii Five-0, with special appearances by O'Donnell's Callen and LL Cool J's Sam Hanna, and then picks up the following Tuesday evening on NCIS: LA, with Alex O'Loughlin's Steve McGarrett and Scott Caan's Danny Williams paying a visit to the west coast.

This is not the first time a NCIS: LA character has crossed over into the Five-0 world. Back in October, Daniela Ruah's character, Kensi Blye, helped McGarrett and Joe (Terry O'Quinn) crack a case with her lip reading services.

"It was great fun earlier this season to see Danni soaking up the sun on Hawaii Five-0, so when CBS asked if we were interested in doing a double episode crossover, we jumped at the idea," says Shane Brennan, the mastermind behind both NCIS series. "What we've come up with is an enormously entertaining, high octane story that showcases the very best of both shows. It's going to be a fun ride."

Adds Five-0 showrunner Peter Lenkov, "Besides the obvious excitement of teaming up with an incredible show, expanding Hawaii Five-0's universe [and] teaming with NCIS: LA on a case with huge stakes, we're interested in exploring the relationship between McGarrett and Hanna, both SEALs with a little history."

Excited to see Callen hang 10 with Danno? How about hearing McGarrett bark, "Book 'em, Hanna"? Sound off in comments section.

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