“Car coming through!

Despite the dreary weather, excitement fills the air, because everyone knows who’s inside the car.

They just haven’t seen him yet.

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Eric Ogden for EW

“Driving from set to where the Impala was, I was getting excited,” Morgan tells EW.

“I was like, ‘oh god, I get to get in the Impala!”

Morgan’s reunion with Baby is the first of many as he returns tothe showafter 12 years away.

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Eric Ogden for EW

It’s about the story.’

Jensen called and said, ‘Hey would you be interested in doing our 300th?’

I wasn’t going to be working at this time so absolutely, sure.

What was it like returning to a character you haven’t played in more than a decade?

“To step into it again, it’s like wearing an old pair of boots.

I’m friends with these guys so it’s a joy to come in.

Today was my first day and you just kind of sit down and do it.

It’s fun and it’s easy.

I remember very well what I did then.

I remember the story and I remember playing with these guys.

Like a father would be, I’m very proud of the guys.

They are two of the best guys.

That’s unheard of.

[Laughs] But this show, there’s something special about it obviously.

It keeps people wanting to be here.”

What does it mean for John to get to see his boys and his wife again?

“I think it means the world to John certainly.

And also for me, the actor that plays John, I think it means almost equally as much.

Kid’s a disaster because of his father apparently.

[Laughs] My thing was always, if I come back, I gotta fix that.

But more than that, it’s three friends, life lived.

“That’s the easiest question.

It’s because of those two dudes.

It begins and ends with Jensen and Jared.

They show up every day, they’re not grumpy, they know their sh-t, they’re pros.

And they’re not only all that, but they’re also genuinely nice.

They’re just good guys and I love ‘em.

That’s the simple answer: It’s because of those two.

They set an example for cast and crew.”

Supernaturalairs its 300th episode on Thursday, Feb. 7 at 8 p.m.

ET on The CW.

A very special coverfeaturing the Winchester familyis also available for purchase exclusively at Barnes & Noble.