I looked up this episode. Turns out it was the 3rd show in the 1st season. Introduced McCoy and Uhura. Its interesting that 3 different people play Balok. One does the acting and two others did his voice. I thought so when I saw it. The lip sinking was excellant though. Better then what I see today in an average music video.
The link below is to a site that shows the scale of the Felarius and the puppet used to intimidate The Enterprise crew.
http://www.sixtiescity.com/startrek/03corbomite.htm Star Trek Frontiers - Reference - Episodes - TOS
The Corbomite Maneuver
Star Trek The Original Series
Season 1, Episode 03
Mission Stardate: 1512.1
First Aired: 11/10/66
The USS Enterprise, on a routine star-mapping mission, makes first contact with the spaceship Fesarius of the First Federation. Although Fesarius commander Balok is initially wary of the Enterprise, presenting a false image, he eventually accepts the assurances of good intentions by Enterprise personnel, after Kirk offers assistance when Balok's ship appears to be disabled. Kirk later assigns Lieutenant Bailey to cultural exchange aboard the Fesarius.
Regular Cast:
William Shatner as Captain James Kirk
Leonard Nimoy as Science Officer Spock
DeForest Kelley as Doctor Leonard McCoy
James Doohan as Chief Engineer Scott
George Takei as Lieutenant Hikaru Sulu
Nichelle Nichols as Lieutenant Uhura
Guest Cast:
Anthony Call as Lt. David Bailey
Clint Howard as Balok
Grace Lee Whitney as Janice Rand
Ted Cassidy as the Voice of Balok
Victor H. Perrin as the Voice of Balok #2
Mittie Lawrence as Crew woman
Ena Hartman as Crew woman
Gloria Calomee as Crew woman
Bruce Mars as Crewman
John Gabriel as Crewman
Jonathan Lippe as Crewman
Stewart Moss as Crewman
George Bochman as Crewman
Production Information:
Written by: Jerry Sohl
Directed by: Joseph Sargent
Extra Episode Information:
This episode marked the first appearance of series regulars Dr. Leonard H. McCoy (DeForest Kelley), Lieutenant Uhura (Nichelle Nichols) and Yeoman Janice Rand (Grace Lee Whitney).
Here is a more detailed plot line.
On the third day of star-mapping (with Lt. Bailey as navigator in place of Ensign Chekov), the Enterprise discovers a giant multi-colored spinning cube. McCoy, who is giving Kirk his quarterly medical examination, fails to inform Kirk about the crisis, quipping (to himself) "If I jumped every time a light went off around here, I'd end up talking to myself." As a result of the exam, Kirk's diet is restricted to salad, much to his chagrin. The cube, which holds a distance of 1593 m, is 107 m on an edge, and > 11,000 metric tons in weight, has an unknown propulsion system which prompts Scotty to admit that it "beats me what makes it go." As the Enterprise tries to maneuver away from the cube, the cube begins emitting deadly radiation and Kirk is forced to destroy it.
Responding to the destruction of what turns out to have been a warning buoy, a mile-diameter spherical flagship known as the Fesarius rushes to the scene. It is piloted by Balok and belongs to the First Federation. Balok threatens to destroy the Enterprise for violating First Federation space and destroying the warning buoy. Balok gives the crew of the Enterprise 10 minutes to consult with their deity before they are destroyed. Prompted by uncharacteristic curiosity, Spock is able to obtain a visual image of the imposing Balok using the ship's monitor during this waiting period.
Kirk saves the day by pretending that the Enterprise is equipped with a secret "corbomite device" capable of destroying any vessel which attacks it. Balok then offers to spare the crew of the Enterprise by towing it to a First Federation planet, interning the crew there, and only then destroying the Enterprise. However, Kirk waits for the tow ship to expend its power, then pulls away, crippling the power systems of the tow ship.
Kirk, McCoy, and Dave Bailey transport to the main ship Fesarius to render assistance. Here, they meet Balok, the pilot of the ship, who greets them and offers them "tranya" to drink. Kirk and company find that the image of Balok they had glimpsed was a phony puppet and that Balok is actually an unintimidating midget. It turns out that Balok did not trust the information he gleaned from his scan of the Enterprise's data banks and was simply testing the Earth men to see what their true intentions were. Bailey, who had panicked during the crisis on the bridge of the Enterprise, remains on the Fesarius to exchange cultures with Balok.