Doctor Who: Into the Nowhere (Time Trips)

The Eleventh Doctor And Clara Land On An Unknown Alien Planet. To The Doctor’s Delight And Clara’s Astonishment, It Really Is Unknown. It’s A Planet The Doctor Has Never Seen. It’s Not On Any Maps, It’s Not Referenced On Any Star Charts Or In The Tardis Data Banks. It Doesn’t Even Have A Name. What Could Be So Terrible That Its Existence Has Been Erased?