Cadets respond to Eren's terrifying transformation with doubt and fear as he struggles to understand it himself. If Armin can’t talk the commander into using Eren’s newfound powers for the good of humankind, all hope of stopping the Titans might be lost.
When Rebecca finds out Josh is a volunteer at a camp for at-risk teens, she realizes it is the perfect opportunity to remind Josh about the amazing times they had together at camp. Meanwhile, Darryl tries to re-capture his youth by throwing a party, where Greg encounters someone from his past.
Mr. Schuester has the Glee Club split up into pairs to sing their favorite ballad, but when one kid gets sick, he’s forced to step in and winds up in a sticky situation. Meanwhile, Finn has dinner with Quinn’s parents.
On the legendary Treasure Island, Luffy and crew encounter strange animals and an even stranger man named Gaimon.
While Sheldon says a tearful goodbye to the final installment of "Fun with Flags," Leonard, Howard and Raj search for something significant in a dead professor's research and Bernadette is shocked to learn of her co-workers’ true feelings from Penny.
Sheldon faces a crisis after Leonard disproves his accidental scientific discovery. Meanwhile, Raj must stay with Howard & Bernadette for a week.
When Amy gets sick, Sheldon tries to nurse her back to health; Wolowitz and his father-in-law plan a fishing trip.
Sheldon considers taking his relationship with Amy to the next level when Stuart from the comic book store asks her out on a date.
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.