Hulk Modern Era Epic Collection: Code Red

Incredible adventures of the green and red Hulks! Domino might have just discovered the Red Hulk's identity, and he can't have that. But X-Force is protecting her, so Rulk recruits a little help of his own. Enter Code Red: Punisher! Deadpool! Elektra! Thundra! Crimson Dynamo! But whose side is the mysterious new Red She-Hulk on? Meanwhile, the Hulk is gone, transformed back to mild-mannered Bruce Banner - seemingly forever. But Banner knows the Hulk well enough to realize he never stays buried long. Traveling to a deserted corner of America, he finds the Hulk's half-alien son Skaar waiting to take revenge on his father. The boy is young, angry...and powerful. But he's not nearly a match for the Hulk. Not yet, at least. So now it's up to Bruce Banner to train the boy! But Norman Osborn has taken charge, and one item on the list for his Dark Reign is to bring back the Hulk!
Collecting HULK (2008) #13-18, INCREDIBLE HULK (2000) #601-605, DARK REIGN: THE LIST - HULK (2009) and material from INCREDIBLE HULK (2000) #600.