This mission will begin immediately after selecting your second class. Follow Cartman out of the house and let him walk. If you have activated the Main Street fast-travel point, you can just use it to reach your mission point without walking all the way there. After you arrive in the mission point, a cutscene will play. You’ll have to fight your rival superhero faction, the Freedom Pals, shortly afterward.
This is a 4v3 battle with your team having the first turn. Wonder Tweek should be prioritized since he has a long range, AoE lightning attack that can also cause Shock status to anyone hit. Make sure to have Craig taunt Mysterion since the latter has very powerful physical attacks. Craig’s blocking buff should be able to tank off most of the damage, keeping your other teammates safe. Tupperware can’t be saved for last since he’s not that much of a threat. Focus your attacks and heal as necessary, and you won’t have problems defeating the Freedom Pals in this battle.
After the battle and cutscene, head back to the Coon Lair to trigger another cutscene and complete the mission.