's Romulan Commander is given the name Dion Charvon in a 1977 Star Trek novel called The Price of the Phoenix, by Myrna Culbreath and Sondra Marshak. In the 1999 novel Vulcan's Heart by Josepha Sherman, her name is given as Liviana Charvanek. It's not clear if either novel is "canonical" but Liviana Charvanek seems to have higher authority and credibility. See more
The Enterprise crew are shocked to learn that their surprise capture may be due to a new cloaking technology possessed by the Romulans. Kirk and crew already encountered cloaked Romulans two years earlier in Star Trek: Balance of Terror
. However, the cloaking technology in Star Trek: The Enterprise Incident
is new because it is improved. The Enterprise was still able to track a Romulan ship, though not accurately, in "Balance of Terror" and cannot detect them at all with this improved version. See more
Enterprise Medical Log, stardate 5027.3, Dr. Leonard McCoy recording. I'm concerned about Captain Kirk. He shows indications of increasing tension and emotional stress.
I have completed the assignment, Captain: a theoretical incursion...
Captain James T. Kirk
Yes, Mr. Chekov, I can read, and as usual, your theoretical evaluations do not tally with mine. Return to your duty, and I'll let you know when your work is satisfactory. Mr. Spock, full sensor scan on the region, please.
I did give a ...