What is this man this monster fantastic four?

This Man This Monster is the title of a story arc featured in Marvel Comics' Fantastic Four series, first published in 1961. The story revolves around the character of Ben Grimm, a member of the Fantastic Four, who is transformed into a monstrous creature known as the Thing.

In the story, Ben is experimenting with a machine that he hopes can reverse his transformation, but it ends up making him even more monstrous. He becomes enraged and goes on a rampage, attacking his fellow team members, Reed Richards (Mr. Fantastic), Sue Storm (the Invisible Girl), and Johnny Storm (the Human Torch).

The story explores the themes of identity, self-acceptance, and the struggle of the monstrous within. It is considered a classic story in the Fantastic Four canon and has been adapted into various other forms of media, including an episode of the animated series The Marvel Super Heroes and the video game Marvel: Ultimate Alliance.