The commander of a Klingon bird-of-prey whose ship is boarded and taken by genetically engineered humans, an incident that brings Earth and the Klingon Empire close to war.
Magh appears at the opening of Borderland. His bird-of-prey comes upon a small ship near the Orion-dominated region between the two powers and takes its occupants aboard, expecting easy prisoners.
The captives are Augments, grown from embryos stolen by Arik Soong and far stronger and faster than any Klingon. They kill Magh and his crew in moments and take the vessel for themselves.
The loss of the ship to humans outrages the High Council, and Starfleet sends Enterprise, with Soong released from prison to assist, to find the Augments before the Empire retaliates. The stolen bird-of-prey remains the Augments' ship through Cold Station 12 and The Augments.