Hawaii Five-O will waste no time introducing fans to its stable of new characters on season two.

Most prominent among them? Terry O'Quinn will recur as the Navy Seal Lt. Commander who trained Steve McGarrett back in the day and who served with his father in Vietnam.

The role will reunite O'Quinn will former Lost co-star Daniel Dae Kim, whose Chin Ho Kelly shakes hands with O'Quinn's armed forces veteran on the season two premiere:

What else can we expect from "Ha'iole?" It will find McGarrett in jail, with O'Quinn's character brought in to help clear his name: