Name the superhero!

[Richmond Clements]

Who's the guy attacking Doomsday in this pic?
I don't think I've ever seen him before. Click on the link to see it, it's too big to post here without annoying people.

Thanks!

Link: http://kevinconradart.com/images/commissions/jla_avengers_ink.jpg" target="_blank">Here!

[Matt Timson]

Captain Atom.

[Lobo Baggins]

From left to right (I think!) - Galactus, Wonder Woman, Superman, Thor, Captain Atom (I think!), Doomsday, Iron Man, the Hulk and Captain America.

[Richmond Clements]

Thankyou!