Blastaar

Blastaar is a alien from the Negative Zone. He is part of The Leaders army. He came to earth several times only to be sent back to the Negative Zone. First time he appeared in a tunnel and took on the Agents of S.M.A.S.H., but was defeated when Iron Man appeared to help them out. The next time he attacked Hoover Dam, where he used a special snake from the Negative Zone to poison most of the Agents of S.M.A.S.H. except Hulk. Again he was defeated and escaped back to the Negative Zone.