Karen Gillan says her 'Doctor Who' experience helped her when filming 'Guardians of the Galaxy'.

Gillan - who appeared on the popular BBC sci-fi show between 2010 and 2012 - was cast in the role of Nebula in the latest Marvel flick and said it was easy to make the transition.

She told the Radio Times magazine: ''There are actually a lot of similarities because it's sci-fi. There's a lot of green screen and reacting to things that aren't there, so I feel like I was trained up for it.

''But the main difference is that everything is just bigger in scale. More set, more people... just a bigger budget.''

The 26-year-old actress also revealed that 'Doctor Who' helped her to secure the lead role in 'Oculus', a physiological horror film directed by Mike Flanagan.

She said: ''[Director Mike Flanagan] is a really big 'Doctor Who' fan and he Skyped with me when I was in my bedroom in Scotland in my parents' house.

''He was drinking out of a TARDIS mug - but he didn't realise he was drinking out of a TARDIS mug - and I was like, 'I've totally got this role!'''

'Guardians of the Galaxy' opens in UK cinemas on August 1.