The towering warriors of Rigel VII, who attacked Captain Pike's landing party shortly before The Cage and were revisited in Strange New Worlds when the Enterprise returned.
The Kalar are large, powerful humanoids who live in a feudal society of fortresses on Rigel VII. Before the events of The Cage, a landing party from the USS Enterprise was ambushed there. Three crew members died and several were wounded, a loss that weighs on Christopher Pike. The Talosians later make him relive his fight with a Kalar warrior as an illusion.
Strange New Worlds returns to the planet in Among the Lotus Eaters. In 2259 Starfleet finds signs of cultural contamination, and Pike discovers that Zac Nguyen, a yeoman left for dead on the first mission, now rules the Kalar as High Lord Zacarias.
Radiation from an asteroid buried on the planet strips away memory. The Kalar of the palace are shielded by its ore, while the labourers outside forget who they are every day.