The Strider

You've been given tremendous power at the cost of your memory. Was it your choice? Were you forced? What's your name? You put on a mask because you don't recognize your own face. Now you're stranded on a hostile planet ruled by warlords while carrying a mystical weapon that everyone is after.   Do you remember the first time you saw a lightsaber ignite? What about the first time you saw a big robot turn into a truck? There are a ton of examples I could use but that's the fun I'm looking to channel in a super fun original sci-fi western package.