"Against Their Nature" is a Star Trek: The Original Series comic published by IDW Publishing in 2007, and is the first issue of the Klingons: Blood Will Tell mini-series, retelling the events of TOS episodes from a Klingon perspective. This story retells the events of "Errand of Mercy".
On Qo'noS K'ahlynn enters her grandfather's office to find him deep in thought. Knowing what is on his mind she asks what there is to decide? The Klingon Empire is in need after the disaster on Praxis, they should be ready to strike out and take what they need to recover. But Chancellor Gorkon has offered an alternative course of action, and the outcome of the High Council's vote balances on Kahnrah's vote. He has been studying the chronicles of the House of Kahnrah for incites into contact with Humans.
As Kahnrah recounts to K'ahlynn, the House is an ancient one, dating back to the time of Kahless the Unforgettable. But in the present they are QuchHa' - while other Klingons might dub them "unhappy ones" the QuchHa' have the superior ambition bread into them by the genetic experiments that remade them, and rose to power in the High Council and fought at the front lines of the Empire's expansion into deep space. And like many QuchHa before them it was Kagh, a cousin of Kahnrah's, who met the enemy on the frontier, while commanding the IKS Vortha.