"The Power of Three" is the fourth episode of the seventh series of the British science fiction television programme Doctor Who that aired on BBC One and BBC One HD on 22 September 2012. It was written by Chris Chibnall and directed by Douglas Mackinnon.
Official poster
The episode featured a cameo by Lord Sugar, filmed on the set of his show The Apprentice.
Physicist Brian Cox also made a cameo appearance, theorising on the origin of the cubes.
Eleventh Doctor
Videos
The Eleventh Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is played by Matt Smith in three series as well as five specials. As with previous incarnations of the Doctor, the character has also appeared in other Doctor Who spin-offs.
The Eleventh Doctor's second costume, first appearing in "The Bells of Saint John" (2013).
Karen Gillan as Amy Pond, with Matt Smith as the Eleventh Doctor, filming "The Eleventh Hour"; Smith is wearing a tattered version of his predecessor's costume, which led to the Eleventh Doctor earning the nickname "Raggedy Doctor." (2009)