DOCTOR Who star Matt Smith time-travels to a different world… to play a gay author in 30s Berlin.

The actor, 27, transforms himself into Christopher ­Isherwood, whose works inspired the musical Cabaret, for a 90-minute BBC2 special.

Fans used to seeing him flashing his sonic-screwdriver in the Tardis may be in for a shock.

One of his conquests is played by Burberry model Douglas Booth, 17. Called Christopher and His Kind, the TV film will be screened later this month.

Matt, dating model Daisy Lowe, says the gay scenes didn’t faze him. He declared: “I’ve kissed lots of boys!”