Justice League: Unlimited episode ‘Patriot Act’. It highlights smaller, unpowered superheroes and really gives a rebuild for why big hitter superheroes aren’t the only important ones. It gives an end to a running character’s arc and gives a good solid basis for characterization for several underrated characters. It ALSO provides a good basis for Sir Justin/Vigilante, showcasing their tight friendship/maybe relationship if you squint. It’s fun, heavy, and wholesome. You don’t need to see the rest of the show. It’s a self-contained episode if you don’t want to watch anything beyond it.