"It is strange being back in the same suit, but it also feels very familiar and comfortable," said Tennant, who is currently starring alongside another Who alumnus, Arthur Darvill, in ITV’s Broadchurch. “There’s nothing quite like Doctor Who. It has a wonderful excitement about it. I always had happy times there.”
Tenth Doctor Tennant will join his successor Matt Smith, along with former companion Rose Tyler, played by Billie Piper, on the celebratory episode, which marks this year’s Who half-century in November.
"It’s lovely to be around Billie again, even though I see her all the time anyway," Tennant told TV & Satellite Week.