Major Klev was a Tandaran military officer who served under Colonel Grat at Detention Complex 26 where several Suliban civilians were being held in 2152 when the Tandarans were at war with the Suliban Cabal.
Klev was notably ruthless in maintaining order among the prisoners, despite the fact that they had no connection to the Cabal. He did not show any leniency to Danik, for example, despite the fact that Danik and Klev's brother had been childhood friends. He was no more civil to the two Human prisoners Jonathan Archer and Travis Mayweather when they were detained at the complex. During Enterprise NX-01's assault on the Complex, Klev was rendered unconscious in the explosion. (ENT: "Detained")