El-Adrel system

The El-Adrel system was a neutral planetary system that was located halfway between the United Federation of Planets and the Tamarian space. The fourth planet, El-Adrel IV, was the home of a non-sentient species. Prior to 2368, according to Federation records, the entire system was uninhabited.

In 2368, a Tamarian deep space cruiser commanded by Captain Dathon chose this system to attempt communication with the Federation. He chose the fourth planet because the opportunity of working together with a Starfleet captain in defeating a member of this species offered a parallel with a story in their mythology. The USS Enterprise (NCC-1701-D) was sent to answer their signal. 

El-Adrel エル・アドレル星系 El-Adrel systeem