Spoiler alert: This post contains plot details from the April 26 episode ofSupernatural.

So that was an enormous challenge, but I looked at it totally as a positive.

As he was told, Its you vs. you, directed by you.

Unfinished Business

Richard Speight Jr. on ‘Supernatural’.Credit: Dean Buscher/The CW

They were like, Dude, have you seen the breakdown for the script youre directing?

I said, Yeah I saw it.

Ackles goes, Your heads going to explode.

Im like, Lets hope youre wrong, sir.

But the workload isnt too much when its a story you love.

And thankfully for Speight, this script contained a story hed wanted to tell for years.

I always knew there was a story here.

That created a real mix of: Is Loki a bad guy or a good guy?

Is Gabriel a bad guy or a good guy?

I just thought it was the most exciting thing thats happened to me in the history of my career.

To me, Loki had a really legit beef with Gabriel, he says.

So honor amongst thieves, I suppose, but nonetheless, Loki had a point!

Thanks to the Winchesters, Gabriel would ultimately survive Lokis wrath.

He has new books in the library that are now part of his history.

Supernaturalairs Thursdays at 8 p.m.

ET on the CW.