Nice to see Christian Kane back, as he has a sanguine onscreen presence which I've liked since I first noticed him in ANGEL.
He, nor the show, is done any favors by the bad acting of co-star Samantha Richelle, who let both down with her rote speech about the "five blocks". This scene required real raw emotion beyond her acting chops. Hopefully experience and time will allow her to become more than the show's pretty face, enabling her to deliver her lines with some believability.
By the way, does her character, Kai constantly wear a bikini under her clothing in preparation for the occasion she may need to be undercover, or perhaps regularly carry one in readiness in her handbag. It was tiny enough to fit.
I do find issue with the premise of the show: sick ex-DEA agent Alex Walker comes to an island in the Philippians for his health, but finds that he doesn't get the rest and peace and quiet he needs to convalesce, as he is continually drawn into dangerous life-and-death situations.
This illness then just becomes a gimmick to get him to the island, and really will only come into play either for dramatic, or even comedic, effort, and nothing else.
Alex Walker may as well not be sick at all, for the actual lack of any real effect it will have on his life and adventures on the island: His illness will slow him down in certain scenarios, will cause him to be in danger in others, and will cause mini cliff-hanger moments at the worst possible times, but in the end will actually lead to nothing of any real lasting consequence.
This will be the status quo of the show (which the audience could get really bored with really quickly), that episode one has already established.
I predict, though that season one will end in a cliff-hanger with Alex Walker collapsing unconscious, and the audience will have to tune in next season to find out if he survived. And then, if the show is renewed for season two, for the audience to find out that it actually wasn't as bad as we all thought. Alex will then get the same reminders and cautions as he did from his doctor at the start of this episode, and for the rest of the season continue on his merry way, following the status quo already established in season one.