This is the best show ever and we should really do a Wiki about it.
The tenth Doctor, a Cyberman, and an old fashioned Dalek or maybe one of the Cult of Scarro. If you don't know what any of these things are than either ask me or Google them.

This is the official site for Doctor Who on BBC.

The Tenth Doctor: He's a Time Lord from the planet Gallifrey. He's 903 years old.
The Cybermen: They are steel giants. They have the strength of ten men and give humanity an ultimatum... Either become one of them... or DIE.