Longtime "Doctor Who" composer Murray Gold recently teased that the 50th Anniversary Special might be a bit controversial.

"There's some really interesting things to say about that but I can't say them. It's very, very well directed," said Gold to Den of Geek.

"There's a thing they've done in it, which might be controversial... It's interesting though."

With Matt Smith stepping down as the Doctor, could this have something to do with John Hurt as another regeneration of the iconic character?

When asked whether the composer is sad to see Matt Smith leaving for season 5, he answered naturally, "Yeah, 'cos he's brilliant. He's brilliant regardless of what he's given to do, which is always good."

"Matt has a very interesting internal energy, which he allows to show. He's a child, he's an old man, everybody knows this. People have had since 2010 to notice this about him. He's really so good."

Most notably, Gold composed the theme for the Eleventh Doctor, "I Am the Doctor." Listen to his composition below:

"I really like that piece of music, there's something lovely about it. It's got three clean parts - it's got a lovely little jokey bit where it goes onto the woodwind [Murray sings], then it's got the big crescendo into the explode bit [Murray imitates brass], it's all space-timey! Then it goes back to the riff. A nice selection of moods in quite a short space of time. It's celebratory as well."

And after the 50th Anniversary Special and Christmas Special, will Gold stick around for season 8, or leave along the footsteps of Matt Smith?

"There's still nothing better to write for. In terms of what it brings out in me, it forces me to write music I'm proud of in a way that a lot of other shows wouldn't. I'd love to carry on doing it because, honestly, there's nothing better to write for."