Episode 6: The Swollen Eyeball senior agents assign Steve and Viera to team up with Dib, changing his status quo in a positive way by giving him allies and real friends.
Episode 7: A more subtle example, as while nothing seemingly major happens, it lays the groundwork for the season's main Story Arc.
Episode 10: Tenn uncovers the truth of the Meekrob ship discovered in Episode 7 and what it was carrying, and is dispatched to Earth by the Tallest to help find it.
Episode 16: A seemingly standard Halloween Episode fight with Norlock and Zim takes a sudden swerve in its last scenes, which reveal that the whole monster invasion was a decoy from stealing Team Save Earth and Tak and Tenn's pieces of the Meekrob crystal.
Episode 17: When the Tallest task Tak and Tenn to retrieve the Meekrob crystal, Zim manages to force them (and Team Save Earth) to retreat, only for a drunken Purple to reveal to Zim that his mission was a fake and they don't care about him at all. Zim briefly undergoes a Villainous BSoD but gets snapped out of it by Norlock; he then goes rogue from the Irken Empire (and convinces Skoodge to join him, pointing out how the Tallest abused him too). After a confrontation with Tak and Dib in the City Cesspool, the Meekrob crystal ends up lost in the sewers.
Episode 19: The three groups all relocate the Meekrob crystal and fight over it. Ultimately, Tak and Tenn retrieve it and locate Project Domination's location, but thanks to a bug planted on MIMI, Team Save Earth hack the information and go after it as well. And then Gaz sends the information to Zim out of spite.
Episode 20: The teams race and fight each other to reach the location of Project Domination, which culminates in Norlock betraying Zim and taking control of the weapon for himself.
Episode 10: While Zim forces his way into an Invaders' tournament that the New Irken Order is secretly planning to assault, Team Save Earth meet the Resisty, whose ship crashes on Conventia with them all aboard after being shot down by the Irkens.
