AVENGERS (1963) #355

The Gatherers are on the prowl again! And their target this time is T'Challa! But not exactly the one Earth's Mightiest Heroes know! It's T'Challa the Coal Tiger! An avenger is his own right, but from an alternative universe! Proctor's plan calls for the Gatherers to capture the Coal Tiger and then kill the Black Panther (aka T'Challa the king of Wakanda)! However to do that, the Gatherers will have to stop by Avengers Mansion to learn the panther's whereabouts