 When his friend Spirit of '76 as Captain America as killed by Adam II, Thunderer blamed the Scientist Guild, also known as the Three Xs and later Enclave, for their role in Nasland's death as they was responsible for bankrolling Professor Horton to create another android like the Humans Torch as well supply Adam-II's programming with the Three Xs's ideas for the next stage of mankind and leading to the android's madness.Changing his identity to Black Avenger, Carstairs swears to take down the Three Xs.However, Thunderer was killed and the Eternity Mask taken by Enclave.