Season 8|Episode 2 Family Goy
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The Young Justice episode with that information has not been aired as of 6 May 2012.
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.
The duration of Justice League of America - TV film - is 1.37 hours.
Fight for truth and justice, alongiside Superman, Batman and the rest of the justice league.
Justice League Superman would win. He would fly to the Hulk and pull him to the ground and then up and throw him onto a mountain and kill him.