Dear Doctor has some serious issues to discuss and does so very well indeed. Confronted by two different humanoid races inhabiting the same planet but possessing conflicting developmental challenges, the crew experiences the type of moral dilemma for which the iconic Prime Directive was created. The problem for the Valakians and the Menk is that this new Star Fleet policy hasn't been ratified yet. Captain Archer very much wants to help these interdependent races but doesn't know who to assist or how to do so.
We see hear the story unfold through the means of a long letter in which Doctor Phlox documents his doubts and discoveries in order to shares them with his exchange colleague Doctor Lucas. This is a well constructed episode with both Rick Berman and Brannon Braga taking writing credit. John Billingsley turns in a faultless performance as he always does when given a worthwhile part and, apparently, particularly liked this episode because he felt it was his first opportunity to flesh out his character.
Movie Night aboard the Enterprise is a good idea which will be resurrected many years down the line in Star Trek Discovery but, as with all those theatrical performances which took place aboard the 1701D, we are often left wondering who is minding the store when so many cast regulars are taking the evening off.
David Kimbel as the Valakian, Esaak, and Alex Nevil as the unnamed Menk give credibility to the plight of their respective races and Kelly Waymire continues to stand out as the lively Crewman Cutler. Jeremy Lewis, recipient of the doctor's revealing missive, does not appear in person until the Fourth Season but establishing him in this episode helps to round out both the professional and the personal aspects of Doctor Phlox.
Senior Trekker scores every episode with a Five.