Science fiction movies from the '50s might seem dated, but the ideas behind them were not. The History Channel explores the oft-overlooked dreams of NASA space engineers in History Undercover: Code Name - Project Orion. When man first walked on the moon, men on Earth were planning an even longer journey. From a manned mission to Mars to a fully operational space station, the physicists' imaginations knew no bounds. Freeman Dyson and Theodore B. Taylor remember the top-secret plans of Project Orion in this one-hour program.