What will Steve do?

ALEX OLOUGHLIN:Its kind of surreal.

I cant believe it, on one hand.

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Credit: Norman Shapiro/CBS

On the other hand, I feel like its been torture, too.

Its hard, man.

Its hard to make a show.

Its hard to make one episode, to make a pilot.

Its a big deal.

What can you tease about the 150th episode and McGarrett trying to save Doris?

They dont know each other yet, but theyre about to.

There are a lot of loose ends that we need to tie up and deal with.

Some of them get dealt with with closure, and one of them kind of doesnt.

One of them is still left up for McGarrett.

Ill let you wait to see which one that is.

How will Steve feel about reuniting with his mother?

His mother is the source of all the drive in his life.

Hes constantly been trying to make up for something that wasnt there.

Shes in the wind, unavailable and emotionally not there.

There are a lot of promises that she never keeps.

What does his dynamic look like with Catherine now?

Its definitely awkward in the beginning.

Hes also annoyed at Catherine because of the way she left.

He understands classified operations, but she did it in a pretty shy way.

Hes been really patient with that woman, too.

He kept waiting for her and being patient.

Still, he was going to propose, but she blew it in the end.

Hes not resentful, but hes trying to move on, and here she is again.

They get to a really good place.

They get to say the things that need to be said, and hear each other say those things.

I really like the place that they get to.

I hate the word empowering, but they both end up in better shape as a result of it.

How do you think this episode honors the show?

Its classic Five-0 espionage, wild action.

We bring the unrealistic into reality.

Pardon the pun, but theres aMacGyver-y aspect to it.

Theres a lot of black ops aspects to it.

Theres a lot of knife work and a lot of explosions, airplanes, gunfire.

ItsFive-0at its best as far as the action goes.

Plus: Theres a whole bunch of character threads through the story that are getting dealt with.

I think its going to be satisfying for the fans.

Hawaii Five-0s landmark episode airs Friday at 9 p.m.