Warning: This story contains major spoilers from Mondays episode of Supergirl.
Read at your own risk!
Hank Henshaws true identity has been revealed and in true Berlanti-verse fashion, there was a twist.

Credit: Darren Michaels/CBS
It turns out that the man who viewers believe to be Hank Henshaw is none other than Jonn Jonzz.
Whats next now that the green alien is out of the bag?
DAVID HAREWOOD:No, I didnt.

CBS
I had no idea.
After the pilot was picked up, my manager told me that they were changing my character.
Thats as much as theyd tell me.
I was intrigued by that.
I didnt quite know what that meant.
When I came to shoot the series, they still didnt tell me.
I did the whole of Comic-Con just lying through my teeth.
I didnt know what I was talking about.
They told me about a week after Comic-Con.
They presented me with a little Martian Manhunter doll and several comic books of Martian Manhunter.
I went home and devoured them.
I thought they were just fantastic.
I must say, I was struggling with Hank Henshaw.
I didnt particularly enjoy the pilot.
For me, it was a lot of exposition.
I just couldnt find an angle that was interesting with Hank Henshaw.
He was all, I dont like aliens, I dont like Kara.
It was all a bit too one-dimensional to me.
So I was delighted that they gave me this guy to play.
Hes just so fantastical and its such a wonderful backstory and history.
It just gave me so much more to play.
Growing up, did you have dreams of being a superhero?
Are you kidding me?
I grew up reading comics.
When I saw the firstAvengersmovie, I was blown away.
Were living in an age where we can make this stuff look so fantastic now.
When they told me I was going to be doing this guy, it was slightly surreal.
[Laughs] Then I told myself to relax.
Hes a 7-ft. green Martian.
While Kara and Kal-El are very attractive humanoids, hes very much not that.
I really love that.
I love the idea that hes probably the most human superhero, yet he looks the most alien.
Theres so much conflict in that and ambiguity that he doesnt fit in.
It gives me so much to play.
Now that Alex knows, how does Jonn feel about the truth being out there?
Will he embrace who he is to help Kara and Alex?
Well see in upcoming episodes.
Its certainly not an easy thing for him to reveal.
Only one other person knows the truth, and thats Superman.
Its a big thing for him to suddenly have somebody else know his true identity.
Thats one of the things they touch upon in the comics.
He runs the risk of falling foul of people if he does tell the truth.
Hes very protective of both Kara and Alex.
He basically wants to keep her safe.
Its a dangerous profession, being a superhero.
People do want to take you on or kill you.
Can you tease what will happen once Kara finds out?
Its a lot of fun.
She perhaps feels as though shes the only one of her kind.
She grew up without parents and she feels somewhat alone.
She will take some comfort in the fact that shes not the only one who she knows.
They both will teach each other things about being different as we go forward.
Hes really warming up.
In the second episode, he calls her Supergirl for the first time.
Alex, particularly, has several doubts, as you see.
Those doubts will continue right through next weeks episode.
Shes full of pride in what hes doing.
Shes also full of questions.
Where do you come from?
Where is you family?
Do you have family?
Those are things that are very deep inside himself, because of his own tragic history.
Will we get any flashbacks to what happened with Jeremiah?
We dont actually see that particular story.
I know Andrew [Kreisberg] has spoken about it.
Im telling you its great fun playing the real Hank Henshaw.
So Im hoping to play him again.
He was a lot of fun to play.
We would be remiss to not tell that story.
Working with Dean was fantastic.
Its such a rich story that it would be a shame not to go there.
Why do you think Hank was so desperate to kill Jonn?
The Hank Henshaw that I know and have been playing is not a particularly nice person.
The DEO under him was a particularly nasty institution.
Hes got a secret government organization, so hes got access to resources beyond the CIA and the FBI.
Hank has always had this God complex, which I suppose is why he comes back asCyborg Superman.
Getting a beat on him, I suppose would be a real success for him.
Will we get any flashbacks to Mars and see how Jonn ended up on Earth?
It was around the same time as those terrible attacks in Paris.
It was just emotional, the idea that people want to kill others.
The White Martians exist purely to kill Green Martians.
They literally put them in furnaces.
It was wonderful playing that with Chyler.
Hopefully that will be another great episode.
Jonn feels deeply that hes the last Martian.
Hes the last of his kind, the only Green Martian left in history.
Maybe prisoners from Fort Rozz?
Theres a White Martian that turns up that wants to kill him.
Hes ready to give his life.
He doesnt necessarily kill humans.
He wants to protect humans and wants to kill anything out there that threatens humanity.
Supergirlairs Mondays at 8 p.m.