Astronaut and Alien Costumes for Boys -- Ready to travel to outer space? Browse our selection of boys' Astronaut costumes, and get ready to launch the best costume party ever. We have all the space suits you need to travel the galaxy. And get ready to meet some aliens! Have your friends dress up in our Alien costumes, so you can make first contact and save the human race. Whether you want to be an astronaut or an alien, our boys costumes are out of this world! Get ready for costume fun all year long... not just for Halloween!