Hawaii Five-O and NCIS: Los Angeles were both off this week, but a minute-long promo for their upcoming crossover event aired during last night's NCIS episode, and it's sure to please fans of both shows.

Agents Callen (Chris O'Donnell) and Sam (LL Cool J) head to Hawaii when there’s a suspect threatening to release a deadly virus into the population. The threat of a global pandemic only grows from there.

The joint task force then travels from Hawaii to L.A. when the suspect in the case moves to the mainland with the virus in tow. Danny (Scott Caan) and Chin Ho (Daniel Dae Kim) make the trip from H5O.

On April 30, the action begins on Hawaii Five-O, carrying over to NCIS: Los Angeles the next night, May 1. The episodes are titled “Pa Make Loa,” which means touch of death, and ... "Touch of Death."

Watch the minute-long trailer for the episode(s) below and see what you think!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.