3rd Doctor and Sarah

"The Doctor is called in by unit to investigate when a number of scientists go missing from a top security institute. Following the kidnappings back in time to the middle ages, he is unaware that investigative journalist Sarah Jane has stowed aboard the tardis.  As events unfold, The Doctor discovers a sinister alien, intent on altering the future of mankind..."

Written By: Robert HolmesDirected By: Alan Bromly