This Klingon courier played a crucial role in the Enterprise
NX-01's first mission and was responsible for the first contact
with humans.  As part of the Temporal Cold War, a Suliban
faction known as the Cabal was used to incite chaos within the
Klingon Empire, staging attacks to make it appear as if the
Klingons were attacking each other. Klaang had obtained proof of
this from a Suliban female named Sarin, and was on his way back
to the High Council when his ship was shot down in Broken Bow,
Oklahoma.  The Enterprise was assigned to return Klaang to his
homeworld, but the Klingon was kidnapped from the ship by the
Suliban. Captain Archer and his crew managed to learn the truth
and save Klaang, successfully delivering him to his homeworld.
Once there, the High Council found the necessary proof of the
conspiracy hidden in Klaang's DNA.