- The guys enter a costume contest as members of the Justice League and convince Penny and Zack to join them.
- Penny starts dating Zack again. Used to being the target of bullying, Leonard, Sheldon, Howard and Raj instead bully Zack through their implications to him that he's stupid. Not fully realizing what they're doing until Penny points it out to them, the guys decide to apologize to Zack in the only way they can. Accepting their apology, Zack decides to start hanging out with them, much to Penny's chagrin. This hanging out leads to the idea that Zack should replace Leonard as Superman in their group Justice League of America costume for the New Year's Eve party at the comic book store, with Penny the sixth wheel as Wonder Woman. These actions lead to questions from Leonard to Penny about why she's back together with Zack.—Huggo
- The guys discover that Penny and her ex-boyfriend, Zack (Brian Thomas Smith), are back together and they take advantage of his lack of intelligence and make fun of him. After Zack finally realizes what's going on and storms out, the guys decide to apologize to him and give him some Milk Duds. Zack immediately forgives Leonard and his friends and goes with the guys to the comic book store, leaving a peeved Penny behind. At the store, the guys realize that Zack would be great as Superman for their Justice League group at Stuart's New Year's Eve costume party, who would replace the short Leonard in that role.
Leonard agrees as long as he goes as Green Lantern, leaving Raj to be Aquaman, much to his distress. They return home with the Justice League costumes, with Howard being Batman, Raj as Aquaman, Sheldon as The Flash, and Leonard as Green Lantern. They even purchase a Wonder Woman costume for Penny. Penny doesn't want to go and suggests that they ask Bernadette or Amy, but Howard says Bernadette is under quarantine and Sheldon says Amy doesn't believe in wearing costumes, leaving no choice, but for Penny to go.
On the night of the party, the guys arrive at the apartment in their costumes. Sheldon as the Flash is pacing back and forth though Leonard says that it looks like he's jogging. Sheldon replied by saying, "This is how The Flash paces". Howard enters proclaiming "I'm Batman". Raj thinks that Aquaman stills sucks. Zack leaps into the apartment as Superman, but can't remember, "It's a bird. It's a plane. It's Superman." Penny enters in her sexy Wonder Woman costume and refuses to wear the black wig. Howard that no one will be looking at her hair (glancing at her cleavage while he says it) and gets punched by Wonder Woman. Finally she refuses to even go to the New Year's Eve costume party at the comic book store after Zack embarrasses her. None of the guys, not even Zack, can convince Penny to go. Since Zack would not go without Penny and the Justice League wouldn't be complete without Superman and Wonder Woman, Sheldon says that they'll have to go in their Muppet baby costumes, but then they make Leonard talk to Penny.
Penny reveals that she is only with Zack because she doesn't want to be alone for New Year's Eve. It is hinted that she still hasn't fully gotten over Leonard. Penny relents, puts the wig on to avoid the "Leonard" question, and the group later wins the costume contest. Sheldon demands that he make his victory speech, however, Stuart interrupts him and lead the countdown to midnight.
When midnight strikes and it becomes the New Year, 2011, Zack is kissing Penny, she looks guiltily over at Leonard for the duration of the entire kiss, while Leonard gazes back at her. The episode concludes with the group witnessing an ongoing car theft on the way back home and despite wearing Justice League costumes, they comically scurry off. None of them, not even Zack, are brave enough to stop the car theft.
That New Year's Day evening, Leonard warns Sheldon that he wants to change the thermostat temperature. Sheldon then imagines himself as The Flash, speeding to the Grand Canyon to scream "Good lord, how you frustrate me, Leonard Hofstadter!" in frustration, to the tune of "Flight of the Bumblebee". Once he is 'back', Sheldon tells Leonard, "Fine".
Title reference: Sheldon, Leonard, Howard and Raj inviting Penny and Zack to be Wonder Woman and Superman in their Justice League team.
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