Halkan homeworld
The Halkan homeworld was an inhabited planet. This was the homeworld for the Halkans, a pacifistic humanoid species. This was a neutral planet. The Halkan homeworld had rich deposits of dilithium.

In 2267, Captain Kirk and some others in the  crew were trying to negotiate rights to mine the dilithium. When they were denied the crystals, they tried to beam up to their ship, but ion storms at the planet caused a transporter malfunction, which displaced Kirk and the others into a parallel universe. When there, they found the Federation crew replaced with a brutal Imperial crew. Spock's  ordered a barrage of Halkan cities. When Kirk heard this, he contacted the Halkan Council and gave them twelve hours to decide, much to Spock's surprise. But  ordered Spock to kill Kirk if he didn't destroy the Halkans by dawn. However, his assassination attempt failed, and afterwards, he helped Kirk and the landing party get back to their universe. ()

Appendices

Background information 
This planet might have a connection with the Halka system.

Apocrypha 
According to the Star Trek Maps, the Halkan homeworld is called Halka II.

According to the s Captain's Peril, Captain's Glory and Cast No Shadow the Halkan homeworld is called Halkan.

The novel Dark Mirror calls the planet Omicron Indi III, while FASA's The Federation sourcebook describes it as the fifth planet in the Nola Boradne system.

External links 
 
 

de:Halkan
mu:Halkan homeworld
Unnamed planets
Mirror universe
Homeworlds