Guest stars:

Barbara Luna            Lt. Marlena Marrow, chemist. the Captain's woman in the parallel universe.
Vic Perrin              Tharn (?) possibly The Halkan ambassodor, leader of the Halkan counsel

Crew Appearances:
Landing party: Kirk, McCoy, Uhura, Scott (also the voice of the computer)
Sulu
Chekov
Spock
Lt. Kyle
Ferrel (?) Capt. Kirks body guard
Vulcan Body Guard
Commander Kennel (?) mentioned, will take Marlena when rejected by Kirk

Story:

While negotiating with the Halkan counsel for dilithium crystals, Kirk, McCoy, Scotty and Uhura are transported to a parallel dimension on an alternate, savage Enterprise due to a magnetic storm on Halkan. In this universe, the Federation is as feared as the Klingons and crewmen move up in rank by assassination. Spock (with a beard) is still first officer, but his logic is coupled with a shocking ruthlessness. Kirk and company try to fit in until they figure out a way home, barely avoiding discovery by those around them. Simultaneously, Kirk tries to convince Spock to see the logic in changing the order; that the Federation will ultimately be defeated by rebel forces and he, Spock, can be the man who can lead the revolution. Scotty ultimately devises a plan by which they will attempt to duplicate the conditions present during the ion storm and transport to their own universe, but if they miss the window of opportunity, they will be trapped there forever.

Halkon: earthlike with human inhabitants who are peaceful, against violence and would willing be exterminated to preserve their ethics. Planet has a pink sky and dangerous magnetic storms.

Facts about the alternate universe:

Tantalus Field: Kirk plundered an unknown alien scientist's laboratory to obtain it. it 'made you Captain.' It is a device installed in Kirk's quarters that zaps people away. (The Tantalus field was invented and used on the Tantalus Penal Colony, by Simon Van Gelder in 'Dagger of the Mind.' But that is in the universe we know and love:)

the Agony booth:  a most effective means of discipline. A device in which a person (Chekov) is strapped in and causes great pain.

an agonizer: a small device worn on the belt used by superior officers on subordinates to inflict punishment and pain.

Standard procedure: phaser barage on cities who resist the Empire

ISS Enterprise: mirror image of the USS Enterprise only backwards.

How Kirk came to be Captain of the ISS Enterprise:
Assassinated Capt. Christopher Pike
Suppression of Gorlan(no other info) Uprising through destruction of rebel home planet, and the execution of 5000 colonists on Vega 9.

Spock uses the Vulcan mind probe on McCoy to get to the truth.

Quotes:
" Its our Enterprise, but it isn't" Kirk
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"So you die, Capt, and we all move up in rank. No one will question the assassination of a captain who has disobeyed prime orders of the Empire" Chekov.
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"I'm a doctor, not an engineer." McCoy.
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"You traitorous pig. I'll have you up by your Vulcan ears." Alt. Kirk.
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I find it extremely interesting". "Fascinating". Spock.
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"Our minds are merging, doctor..our minds are one. I feel what you feel. I know what you know" Spock.
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"In every revolution there is one man with a vision" Kirk.
"Capt. Kirk. I shall consider it." Spock.