Hawaii Five-0 Season 4 Episode 1
Aloha ke kahi I ke kahi (We Need Each Other)
-NLM terrorists take over 5-0 headquarters, trapping Chin Ho inside.
-The terrorists are in search of one of their own, who is actually off-site with McGarrett and Danny.
-McGarrett and Danny return to headquarters with their captured terrorist--but it turns out that the other terrorists don't want to free their fellow gunman, but make sure he is dead.
-They murder him, then turn themselves in.
-But another NLM terrorist has taken Catherine hostage, and will release her only if McGarrett frees the other terrorists.
-McGarrett does free them, running afoul of new SWAT captain Lou Grover (Chi McBride) in the process.
-With Catherine released, the 5-0 pursue the terrorists, engaging in a car chase and a gun battle that leaves all the terrorists dead.
-McGarrett gets Wo Fat to admit why Doris McGarrett visited him--Wo Fat says it is to apologize for killing Wo Fat's father. But he does not explain why Doris would want to apologize for this, despite McGarrett's pleas.
-McGarrett asks Dr. Bergman to check a DNA sample he took from Wo Fat, and see if he is his brother.
-Chin Ho calls Kono to warn her--he thinks the NLM may have stolen her location information, and sold it to the Yakuza.