In 1992, South African arms dealer Ulysses Klaue was enlisted by Prince N'Jobu of Wakanda to infiltrate the isolationist country and steal a cache of Vibranium. While Klaue's mission was successful, N'Jobu was executed by his older brother, King T'Chaka, after his role in the attack was exposed. Klaue, meanwhile, was branded with the Wakandan symbol for "thief" as punishment for stealing the vibranium.
Twenty-three years later, Klaue was forced to surrender the metal to the rogue artificial intelligence Ultron, who cut off the dealer's left arm in a fit of rage. Klaue then managed to escape with his life while Ultron and the Avengers engaged in an open confrontation.
Using stolen Wakandan mining technology to create a weaponized prosthetic arm, Klaue proceeded to team up with former black-ops mercenary Erik Stevens before setting out to steal and sell weapons made of vibranium on the black market.
Learning about the existence of a warhammer being housed in the Museum of Great Britain in London, Stevens and Klaue made their way to England with their criminal associates Linda and Limbani. Upon arriving in London, Ulysses Klaue and Limbani went undercover as paramedics while Linda began working at the museum as a barista.
On the day the heist was set to take place, Erik Stevens infiltrated the museum in civilian clothes and made his way to the exhibit where the warhammer was on display. As he stared at the warhammer, Director Thomas entered the exhibit with a cup of tea in her hand, looking at Stevens' curiosity upon one of the artifacts. Noticing his interest, Thomas immediately struck up a discussion about the historical context of two tribal masks that were also on display.
When Stevens asked about the warhammer's historical context, Thomas stated that it was originated from Benin and was taken from the Fula tribe before sipping her tea. Stevens then corrected her, stating that, while the warhammer was stolen from the Fula by British soldiers, it originated from Wakanda. She begins to choke, as he tells her that he had poisoned her drink. The Medics arrived to the scene, but the guards were killed, revealing to be Limbani and Klaue.
Meanwhile, Killmonger's girlfriend, Linda has hacked the security feed to loop footage as if nothing is happening in the African exhibit. Klaue teased a guard with the chance to escape, only to shoot him too, and uses his prosthetic arm to shatter the glass and vibrate the unimportant material off of the vibranium. With the metal acquired, Killmonger, Linda, and Klaue escaped into an ambulance and got away.
Shortly after the robbery became public knowledge, General Okoye of the Dora Milaje discovered Ulysses Klaue and his men were taking the artifact to South Korea, where Klaue was planning to sell it to an unknown American.