"He is a really sad boy who doesn't have a family and is dying to know who he is and where he comes from," says Pine."It's a simple story really but the meaning of this movie is that there's something untouched and wonderful about the childhood imagination.
"I think the gift of these superheroes, these guardians, is not exploding stuff and bows and arrows and all of that, but the power to believe. Their desire is to make these children believe in everything and we, as adults, have the ability to do that too."
Was it nice to slip back into the uniform again for Star Trek Into Darkness?
"Oh I loved it - it's no hyperbole," he insists. "We have a great group and it's a really tight community of people I go back to work for. I just met Scarlett Johansson the other day and we talked about her experience on The Avengers and it sounds similar - that it's such a huge film but at least if the people you get to work with every day have a sense of family, it makes the time pass that much easier and it does make you look forward to going back to work."
It also meant reviving his mateship with New Zealand's own Karl Urban, who plays Dr Bones McCoy.
"I love Karl. I f***ing love Karl Urban. I really do. He has a tender place in my heart. Karl is the best looking geek on the planet. He is such a geek. And I mean that in the most loving way. All of us really get along because we are so different."
And Pine will cap off the year as Clancy's CIA analyst (last portrayed by Affleck in 2002) in Jack Ryan, in which he co-stars with Keira Knightley, Kevin Costner and Kenneth Branagh, who also directs.
"It's about the birth of the character. They are revamping the whole thing. It's the story of how Jack Ryan became the Jack Ryan we know from the former series. The interesting thing now is that it's 2012, so it's a different kind of American spy movie. In 1989 you could make a Cold War story easily, by discerning between good guys and bad guys, but in 2012 it's more difficult. The wars are much greyer now. So it will be an interesting and, hopefully, intelligent film."
Who: Chris Pine
What: The Guardians (screening now); Star Trek Into Darkness (May 16); Jack Ryan (due end of 2013)
- TimeOut