Doctor Who: Expect a huge cliffhanger for that Zygons 2-parter 

bringing back Osgood and a classic monster - and writer Peter Harness has promised a huge cliffhanger for the two-part adventure.

Harness - who previously wrote series 8\'s \'Kill the Moon\' - has scripted a second adventure for Peter Capaldi\'s Time Lord, which will reintroduce both Ingrid Oliver\'s character and the shape-shifting alien Zygons.

"It\'s a bit unbelievable to be bringing [the Zygons] back again - and also Osgood as well, another fan favorite," he told Digital Spy.

"It\'s a privilege to be telling a story about those two, and I think it\'s quite an exciting story as well. Unfortunately I\'ve got two fan favorites in my hands now, which can only set me up to disappoint people!"

is expected to revive the two-parter format, with Steven Moffat previously telling DS he is "changing the rhythm" of the show.

"It\'s nice to do a cliffhanger," said Harness. "And I tried to do the biggest cliffhanger I possibly could."

Fans will have to wait a few months yet to find out what peril he\'s invented for the Doctor and Clara (Jenna Coleman) - with

- written by Peter Harness - begins this Sunday (May 17) at 9pm on BBC One.

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