'Doctor Who' will shake up the show with a lesbian storyline.

Madama Vastra - a lizard-like Silurian alien with a penchant for women - will reportedly fall for the Doctor's new sidekick Clara, played by Jenna-Louise Coleman, on the popular BBC One programme.

A source told the Daily Star newspaper: "Steven Moffat loves to shake up the show. What better way than a lesbian storyline?"

Head writer and executive producer Steven was inundated with requests to bring back the likeable Madame Vastra, who first appeared in 2011.

The cheeky character, who was shown sharing a house in Victorian London with her girlfriend Jenny, helped the Time Lord rescue Amy Pond and her baby Melody and was a real hit with the sci-fi show's fans.

'Emmerdale' actress Jenna-Louise, 26, is taking over from Karen Gillan and joining Matt Smith, 29, as the Doctor's latest sexy sidekick.

Matt confessed: "Jenna brings a really different energy to the show - one which I think is very interesting."