The former EastEnder and 'Bionic Woman' actress starred in the Doctor Who Easter special.
Ryan played the mysterious Lady Christina de Souza in the special episode, entitled 'Planet of the Dead'. She said: "I'm a huge fan of Doctor Who and very excited to be joining David Tennant and the Doctor Who team." Comedian Lee Evens also appeared in the episodes in April.
2009 (Easter special)
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
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