Episode 428--The missing episodes of Doctor Who

"Doctor Who" has had a storied history these past 60 years, but thanks to the economics of television at the time, it - much like that of any TV show at the time - is sketchy at best. But recently, the BBC has ramped up efforts to find and restore episodes long lost to tape wiping by any means necessary. We look at how this piece of TV history is being preserved and what is still missing media.