Which superhero is known for saying 'It's clobberin' time!'?

The superhero known for saying “It’s clobberin’ time!” is The Thing.

The Thing is the superhero identity of Benjamin Jacob Grimm, a founding member of Marvel’s Fantastic Four. His rocky orange appearance and immense strength result from cosmic radiation that transformed the team during its origin story. Although Ben often resents his altered body, his courage, humor, loyalty, and determination make him one of the team’s central characters.

The Thing first appeared in Fantastic Four #1, published in 1961, created by writer Stan Lee and artist Jack Kirby. His catchphrase usually signals that a fight is about to begin, but it also reflects Ben’s personality: blunt, confident, and fond of dramatic entrances. The phrase has become one of Marvel’s most recognizable superhero quotations.

The line is sometimes mistakenly attributed to the Hulk because both characters are powerful Marvel bruisers and have fought each other repeatedly. The Hulk is a separate character, Bruce Banner’s alter ego, while The Thing is a member of the Fantastic Four and is commonly associated with the Yancy Street neighborhood in New York City.