Presuming you mean the "Justice League" series (2001-2006), there is no such episode where he 'meets them'. He was there at the end of "Secret Origins Part 3" when they decided to become a team but he declined to become a full member but told them to call when they needed him.
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I am not sure if there is hawk boy but there is hawk girl. Hawk Boy could have been in one of the issues but he may have quit JLA or was killed.
Pre-Crisis continuity: He felt he had outgrown the role and that Robin belonged with Batman but since Dick was pretty much out of Gotham and hanging around the Titans, he decided to pass the mantle to Jason Todd. It was a peaceful transition and Batman was okay with it. Post-Crisis: He didn't quit, he was fired. He quit being Nightwing because Bruce died and there was no Batman in Gotham. Villains and criminals had a field day terrorizing the city since Batman wasn't around. Realizing Gotham needed it's protector, Dick took over the mantle of Batman and gave up on being Nightwing.
Yes because he didn't want to sing in every episode and in the first episode he quit not only for singing but Duncan was tired of listening to Courtney and Gwen fighting so he quit, and for all you double lyers out there he does come back in the episode i see London at the end he and Gwen kiss! then tyler pops is head in! i repeat he does come back!!
There will not be and has not been a nother episode on sonny with a chance since new girl because demi lovato quit... Rumor has it that it will start back up in the summer but Demi Lovato will not star in it it will just be called so random. Demi Lovato didnt quit she just went to rehab. she has not been up to doing more episodes. so that is why they are doing so random.
yeah that was the last episode. they never made up from there big fight in i quit icarly!i mean ya they hgged but it didnt say there pals again!