What are the most important enzyme antioxidants and what do they do?

Catalase: converts hydrogen peroxide into water and oxygen 2 H2O2 → 2 H2O + O2 superoxide dismutase ROOH + 2 GSH → GSSG + H2O + ROH glutathione peroxidase: converts superoxide into hydrogen peroxide O2 - + O2 - + 2H+ → H2O2 + O2