Re: She-Hulk and Thing ???
This is Fantastic Four Versus The X-Men #4. It being a four issue mini-series, it is for the most part self-contained. I couldn't tell you from memory why they're both there, but skimming through the first issue, I can tell you:
She-Hulk was back with the Avengers, but in her lawyerly day job was either defending or considering defending Magneto, who was being a good guy at the time and leading the X-Men in Xavier's absence. She gets caught up when her and Ben try to hold up a collapsed building and Magneto flies in to help.