Hey guys, I have a question and hope someone here could answer it.

During Mark Waid's run on the Fantastic Four, we had the arc where Johnny becomes a herald and during the story Galan's essence is separated from Galactus' energy and thus is returned to his more "humanoid" form, the energy eventually would return to him, but in order to avoid becoming Galactus once more, Galen imprisoned himself in another dimension.

My question is: How and when did he come back ? I read all the following F4 runs and I don't remember any explanation as to how Galactus returned.