04/02/2013 04:28 pm ET

'Doctor Who': Zygons Return In 50th Anniversary Special

"Doctor Who" is bringing back the Zygons. The shape-shifters will appear in the 50th anniversary special.

According to BBC, aside from flashbacks, Zygons have only appeared more than 30 years ago during the Fourth Doctor's adventure, "Terror of the Zygons."

In addition to the Zygons, the 50th anniversary special is bringing back Billie Piper and David Tennant. Yes, Rose and Ten are coming back. Current "Doctor Who" stars Matt Smith and Jenna-Louise Coleman along with John Hurt and Joanna Page will also star in the 50th anniversary special.

Production on the 50th anniversary special has commenced. BBC tweeted a photo of the two Doctors after the first table read.

Click through the slideshow below to see pictures from the new season of "Doctor Who." Head over to BBC American on Tumblr for more on the Zygons.

"Doctor Who" Season 7