The game, which takes place in an alternate timeline and imagines what would have happened if time travel had been used by both Albert Einstein and the Soviet Union, features an epic global confrontation with you at the controls of your chosen faction.
Atkinson said: "I'm a gamer and the chance to act in one of the best loved game franchises was an opportunity I was really keen to explore - especially as Eva is such a strong female character. The worlds of gaming and film are getting ever closer and as an actress I wanted to explore this exciting new area of drama, broaden my acting skills and continue the active, outgoing side of my personality that I showed in I'm A Celebrity..."
Gemma was in Hollyoaks for five years as troubled teenager Lisa Hunter. She later appeared in ITV's primetime show Soapstar Superstar and last year she bravely stepped into the Aussie jungle to battle in the bush tucker challenges in I'm A Celebrity...Get Me Out Of Here!. She has a role in forthcoming Brit flick Boogie Woogie alongside Jamie Winston, Christopher Lee and Heather Graham, which hits cinemas nationwide in August 2008.
EA marketing manager Stuart Lang said: "It's great to have Gemma on board for such a popular gamers' game as Command & Conquer Red Alert 3. We hope that fans of both Gemma and the Command & Conquer universe will be delighted at what they see when the game goes on sale in October. She will also be taking part in EA's Be The One event in Trafalgar Square later this year, which forms part of the London Games Festival."