Ua Hiki Mai Kapalena Pau (Until the End is Near) Hawaii Five-0 : Season 1 Episode 23

With the invaluable information that was shared by Agent Jenna Kaye, Five-0 is closer than ever to capturing Wo Fat. Their mission takes an abrupt turn, however, when Danny is exposed to a lethal neurological agent that presents an even greater threat: bio-terrorism on the island.