As fans know the Sontarian Experement was shortened due to an injury to Tom Baker, this of course led to some changes in editing. It seems at times to be an uneven story but Baker pulls it off. It makes a fine lead in to the introduction of the BEST villian since the Master.

Davros is the perfect villian. He, as the creator of the Daleks brings a measure of controled evil to the entire concept of the greatest foe of Dr. Who.

There are those who might say that the introduction of the character cheepens the Daleks. I disagree, Davros is such a compelling character and he is played so well in this episode that he becomes the foil that Tom Baker has been waiting for. It is a shame we will see him only one more time in his seven years, but it will again be a special moment in the series.

The episode itself is acted well and the moral decision placed upon the doctor adds to it. A fine supporting cast makes it shine aided by one of the best scripts turned out for the series.

Clearly the best of the first year of Baker. In the top three of the best "Sarah" episodes. Buy it.