Okay, so this is something I cooked up a little while ago. I have this basic idea to do a story revolving around an alien criminal, who has finally been captured. The rulers of the alien's empire decides to maroon him on a remote planet as his punishment, but they don't wish him to remember what they did, so he won't try to get revenge in the event he finds some way off said world. Therefore, they put a high-tech collar on his neck, which sends electrical signals to his brain that blocks his memories of being a criminal. They then shoot him in a pod onto the world they have chosen: Earth. Now, here's where I find problems. Now I have a protagonist, who has no clue who he is and why he is wearing this collar, and he has landed on Earth. I haven't decided which era he has landed on Earth in. I basically want to do a story where this guy becomes part of whatever society he stumbles across upon coming out of the pod, and a few years later, an army of aliens appears on Earth, planning to conquer the planet. Now he must defend Earth, while at some point the collar is removed, forcing him to confront who he once was. These are just general story points I intend to use at some point: I just need a good layout for it. Any ideas, friends?