- Surprise, surprise! Sam has a twin sister named Melanie. Even more of a surprise, she's much girlier than Sam and quite fond of Freddie, who suspects that she's actually Sam in disguise. In the meantime, Carly offers to tutor a boy named Chuck, who has been a sworn enemy of Spencer, who struggles to convince her that he's a little brat.—Daniel Timothy Dey
- After Freddie (Nathan Kress) is teased for being very gullible (he receives an email from Carly (Miranda Cosgrove) and Sam (Jeannette McCurdy) and dresses up as a clown, believing that it's Clown Day at school), he believes the girls are trying to prank him when Sam says her twin sister named Melanie (also played by Jeannette McCurdy) is coming to Seattle since she goes to a boarding school. He is unconvinced that Sam really has a twin sister, and to try to prove it, he asks Melanie out on a date, thinking that Sam would never go on a date with him.
The plan to try to prove that Melanie is really Sam takes an unexpected turn when Melanie accepts his invitation, doesn't act like Sam and then kisses Freddie at the dance club, causing him to believe that Sam kissed him on purpose. He immediately becomes extremely paranoid. In the end, since Freddie refuses to believe it, Sam "admits" to Freddie that there is no Melanie. Satisfied, Freddie departs shortly before Melanie arrives to go to the mall with Carly and Sam, proving her existence once and for all to the audience (although not to Freddie). Carly gets a job tutoring Chuck (Ryan Ochoa) in math, to which Spencer objects, as Chuck keeps tormenting him. After Spencer (Jerry Trainor) shows Carly how awful Chuck really is (with the help of a hidden video camera that Spencer set up that Socko lent him), Carly thinks of a way to get back at Chuck. She makes up the number Derf and teaches it to him, so he can use it on his next math test. When he fails his test, Mr. Chambers (Chris Harper) says Carly no longer needs to tutor him, and decides to send Chuck to Camp Add-'Em-Up for the whole summer (at Spencer's suggestion).
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