Changes from Season to Season
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Changes from Pilot to 1st Season
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The opening credits were changed to include a swoosh when the Enterprise flew
by and the famous "Space...The Final Frontier" intro was added.
Changes from 1st to 2nd Season
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The opening credits were changed to include DeForest Kelley as one of the main
stars, in addition to William Shatner and Leonard Nimoy.
Thanks to a Pravda article, Ensign Pavel Chekov (Walter Koenig) was added to
the cast.
Grace Lee Whitney, who played Yeoman Janice Rand, was no longer in the cast.
Changes from 2nd to 3rd Season
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The opening credits were changed from yellow to blue.
