Carlos Dash was a person who had little patience. He had been a slave who suffered his first death in 1817, when he was lynched. He would later hunt and kill his former masters after reviving as an Immortal.
A half-century later, in 1865, Carlos would take advantage of the chaos and violence following the American Civil War to specifically target active Ku Klux Klan members. When his insufficiently-subservient behavior lead to what appeared to be his death, Carlos took great pleasure in returning as a "ghost" to torment and attack his killers.
In the year 1972, he made the acquaintance of the Immortal Winston Erhuero, who introduced him to Jacob Kell. After attempting to sell Kell marijuana, Carlos became part of Kell's cadre, they tracked down other Immortals and wounded them so that Kell could take their heads with ease. Carlos used a claw-like weapon and a gun in combat. He and Kell didn't like each other, and it was only a matter of time until it would go wrong.
Later, they attacked Duncan MacLeod at the ruins of Connor's antiques store in New York City. During the battle, Duncan fought Immortal Jin Ke in hand-to-hand combat, while Carlos watched from the background. Carlos then wounded Duncan when the fight was broken off by Jacob Kell, Carlos, shot the Highlander multiple times, sending Duncan tumbling out of a window. Kell became angry over this act, and beheaded Carlos in a rage.