Metamorphan

Metamorphans were a sentient species native to the planet Metamorpha. They were originally humanoid until hundreds of years prior to the 23rd century, when they were transformed into energy beings after a meteorite struck their planet, changing its chemistry and vaporizing their bodies. In 2266, the USS Enterprise (NCC-1701) explored the planet, having discovered tiantianium deposits there. The Metamorphans made mental contact with Spock and influence him to construct a device to reverse the meteorite's effects on the planet, which also returned them to their original state. 

Known individuals

 * Textra
 * Zarman