'Doctor Who' star 'shocked by finale twist'

Doctor Who star Karen Gillan has admitted that she did not predict the twist ending of this week's mid-series finale.

The actress, who plays Amy Pond, told Total TV Guide that she was shocked by the revelations in 'A Good Man Goes To War'.

Gillan said: "This is… when we discover who River Song (Alex Kingston) really is. It's such a huge pay-off, I didn't see it coming."

She added: "We end on a revelation so huge, everyone will need the whole summer to digest it."

Gillan also dismissed suggestions that the most recent series of Doctor Who has been too scary for younger viewers.

"I'm all for it getting scarier!" she said. "Kids are cool with it, it's just the adults who worry. This [last] episode is full of shocks and twists, but it's more disturbing than scary."

The Doctor Who mid-series finale airs this Saturday on BBC One in the UK, and will air the following week on BBC America.

> Doctor Who actress teases finale role

Watch a trailer for this week's episode of Doctor Who below: