This episode is going down as one of my favorites. Very entertaining. The sound effects of the neanderthals were classic. This episode reminded me of Frank E. Peretti's book "Monster." Great book. This is defenitely a step into the contemporaty for Mystery Theater. I listened to all of the episodes from 1974--most of those story lines could have taken place in the 1920s or 30s. The newer episodes (if you can call 1978 "newer") deal with modern day themes--at least modern for 1978. This episode would be a great for a  first timer. 5 stars.