The Tenth and Eleventh Doctors will star alongside Billie Piper and Jenna-Louise Coleman in the "Doctor Who" 50th anniversary special.
The official "Doctor Who" Twitter account tweeted a photo from the first read through of the new special.
— Doctor Who Official (@bbcdoctorwho) April 1, 2013
This will be the first time Tennant has reprised the role of the Tenth Doctor since leaving the show in 2010. Piper, who played Rose Tyler, last appeared in Tennant's final episode, "The End of Time."
Filming on the special, which also co-stars John Hurt, begins this week in the UK. "Doctor Who" executive producer and writer Steven Moffat is penning the script and Nick Hurran will direct.
Check out photos from the new season of "Doctor Who" below.
"Doctor Who" airs Saturdays, 8 p.m. ET on BBC America.