Ultimate Power #4 (2007)

Ultimate Power, Part 4
The Ultimate heroes decide to follow Reed into the other dimension, using the mystic abilities of Thor's Mjolnir to get there. Reed is already working to find a cure for the problem he was sure he'd prevented, and Fury has a conversation with someone unrevealed about the need to get Reed out of there before he can study the probe in enough detail to discover something he wasn't meant to discover.
Release Date: 2007