Though J’onn J’onzz is one of DC Comics’ oldest and most powerful characters, there’s always been a way in which he’s existed ever-so-slightly out of the spotlight, save for a few solo series here and there and a number of appearances across various live action and animated television shows.
Source: io9 – Martian Manhunter’s Steve Orlando and Riley Rossmo Would Like to Introduce You to J’onn J’onzz