Five-0 and the NCIS: Los Angeles task force team up in Hawaii when there’s a suspect on the loose who is threatening to release a deadly virus into the population. Series crossover part 2 is NCIS: Los Angeles S03E21.
I’m watching Hawaii Five-0 2×21 “Pa Make Loa (Touch of Death) (1)” https://trakt.tv/shows/hawaii-five-0/seasons/2/episodes/21