When it finally happened midway through season one, the fan reaction was profound, and almost uniformly positive.

It was a great episode, Mr. Harewood said ofHuman for a Day and its surprise ending.

What was really cool was seeing the online reaction.

A couple of people posted videos with people literally jumping up and down.

Its pretty cool that people love the character that much that they were excited to see.

It just looks awesome, the character looks cool and the outfit is great.

I asked him if he knew early on what the real story behind Hank Henshaw was.

I had no idea what character I was playing, Harewood says.

I knew it was changing but I didnt know what it was changing to.

Im just glad it was Martian Manhunter.

Once he found out which iconic DC Comics character he was playing, he did his homework, though.

I spent three weeks just reading Martian Manhunter comics, he says.

I wasnt familiar with the character.

I couldnt wait to play him.

Its been a real honor and a privilege.

It was very emotional, Harewood says.

When [Jonn] tells the story about his kids dying, its pretty deep.

Theres lots of echoes with the holocaust.

I thought the way it was written was beautiful.

He also has an idea of who else from Jonns past hed like to see on the show.

Having a bad guy brother would be pretty awesome foe to deal with.

Well have to wait and see.

As for what it takes to actually create Martian Manhunter on screen, its sounds fairly straightforward.

I asked how much of that performance is actually David Harewood and how much is a CGI creation.

The face is motion capture, but I have to physically embody the guy.

Putting the suit on is awesome.

I love the outfit.

It looks so cool.

Its a good look and its great that people are so pumped ever time he arrives.

Theres going to be a little bit of tension, Harewood explains.

In the first two scripts it nearly kicks off with Superman.

You see a bit of backstory immediately, he continues.

Theres another great reveal of how they met and why they fell out.

Its going to be cool, I think people are going to be excited about it.

SupergirlSeason 2 premieres on October 10 at 8 pm.