The below description is taken from LEGO.com.
"Greetings, strange creatures. I come in peace!"
This brave and intrepid space traveler doesn't quite realize that he's not out exploring the cosmos. The Spaceman walks in long, slow bounds across the landscape, somehow ignoring the fact that gravity is perfectly normal for everything else around him. He's friendly and fearless, always happy to investigate a strange new place or salute a stranger with a universal-greeting hand gesture, but his unshakeable belief that he's dealing with alien creatures and worlds can lead to a lot of confusion for everyone involved.
The Spaceman carries a sci-fi gizmo for just about any situation, including hi-tech binoculars, a grappling hook, a jetpack and even a tiny, remote-controlled space rover. Just be careful if you startle him into thinking that you're an attacking hostile alien - his futuristic Electro-Zapp blaster fires a zig-zagging electric beam that can zap the hair right off a minifigure!