Basing its premise on a popular conspiracy theory, Moonwalkers takes us through the Swinging Sixties with Agent Kidman (Ron Perlman) attempting to make fake moon landing footage just in case the actual Apollo mission fails. He goes off to London to meet with Stanley Kubrick's agent to drum up a meeting with the director so he can convince him to do the project. Instead, he meets with Jonny (Rupert Grint) who poses as Kubrick's agent so he can pocket the cash for himself. Jonny passes off his friend, Leon (Robert Sheehan), as Kubrick and things go downhill from there. It's pretty much a play on "Can this day get any worse?" Fun fact, it really does.
Ron Perlman's performance was the most entertaining aspect the movie. It's the standard fish out of water angle, but Perlman does a lot with the role. Kidman is a man tormented by hyper realistic hallucinations of his time in Vietman and has an unsteady hand to show for it. He just wants some time off and his contempt at being assigned to find a man in drug-filled England shows throughout the movie. There are a couple of scenes that feel out of place, like a beating in a public restroom that was pretty brutal, but for the most part his performance was entertaining. There's a scene in particular where he trips hard on acid (which apparently is a miracle cure in this universe). Seeing him hobble around an artist commune while confronting his demons and hallucinating about a gorgeous dancing redhead was the most engaging part of the film. Needless to say, stuff gets real weird real fast.
Aside from Perlman's performance, the movie does tend to drag a little and, at times, struggles to keep your attention. When it's waning, it throws in some more drug jokes and some topless women to keep you watching until it gets to the next gag. Grint and Sheehan's characters start off funny but at some point their antics do get a little frustrating. You get the feeling that, like Perlman, they didn't have a lot to work with and just did the best they could with flimsily written roles.
Overall, while the movie has an interesting concept and is entertaining at some junctions, a lot of gags do fall flat and there just aren't many laughs. Throw in some extreme violence that feel out of place and you have a movie that had a lot of potential that it couldn't quite grasp at the end.