Bob's Bots

What would you do if you were all alone in the world? Twelve-year old Bob never thought he'd have to find out.  But after a missile strike forces him into a secret underground bunker called Raven Rock, Bob suddenly has no one but himself - and his father's master key card - for company. With a little imagination (and a lot of tinkering), Bob builds a brand-new world filled with tiny, amazing robot...