Arc 4-Sisters: At school, a bully named Tony picks on Tedd, who wants revenge. We're introduced to Susan. At Moperville South, the school Justin and Nanase go to, Nanase tells Justin she was never really attracted to Elliot. He thinks she might be gay, to which she vehemently denies. After school, Tedd runs into Elliot's house, saying he's in trouble. He was testing the gun's Girl Form on himself, to see if it would work on Tony, but now the safety is broken and Tedd's stuck as a girl until he fixes it. Elliot comes up to Tedd later, not sure if he's turned back or not because of how girly he looks. Tedd has, and the statement pisses him off, and in his rage he hits Elliot with the gun. (PLOT POINT WAY DOWN THE ROAD.)
It turns out he'd set the gun to Female Variant Number 5, which makes the person look more attractive, bisexual, and release pheromones making guys and girls attracted to you. And the gun broke. Elliot will be stuck this way for a month. Elliot tells his parents, and they barely react. They're used to weird stuff. Elliot goes to school claiming to be Elliot's out-of-town cousin, Ellen. Grace has done some research, and found a mystical artifact called the Dewitchery Diamond said to cure anyone cursed into another form. And it's being held in a barely watched government warehouse. As they drive to the warehouse, they have Sensei Greg watch Tedd's house to make sure Grace is safe.
He and Grace discover that the TF Gun has changed how she morphs, before she conserved mass between forms, but now she doesn't because magic. They are then contacted from a Tedd from a different universe. They call him Beta Tedd. He gives her a warning we don't see yet. Meanwhile Tedd and Elliot have reached and easily broken into the facility, and find the diamond. Elliot touches it, and he does become a man. However it also creates a clone of Elliot who is still a girl. She is confused, because she has all of Elliot's memories. Tedd theories that since the form was only going to last a month, she might as well. She kinda snaps, vowing to ruin Elliot's life. (On another critical tangeant, this scene is mostly well done. You really feel for Ellen, and the fight is pretty awesome.) They fight, and she escapes with Elliot's car.
Tedd and Elliot are knocked out by the guard, who ran up after hearing the commotion. When they wake up Tedd has found out more stuff about the diamond, including the fact that Ellen won't disappear in a month. A long time ago a wizard apprentice was good friends with a nobleman, who was cursed to become a werewolf. In order to help his friend, the wizard enchanted a large diamond of the noble's to remove any curse. Sadly, it removes the curse by making a copy of the original with the curse, leaving the original fine. This left a human noble and a werewolf who was wolfy all the time, not just on the full moon. The noble died battling the monster, and the apprentice...well, I can't say. (PLOT POINT!)
They get let out of jail, and have Elliot use Tedd's old Transformation Belt to turn half-cat, so he can carry Tedd back to Moperville. The next day, Ellen does around trying to ruin "Ellen's" good name (The principal knows the truth and would blame Elliot.) but largely fails. After Elliot is too tired to run, they catch a ride with a guy named Hedge. Greg wakes Grace up from a nightmare, and they get contacted by Tedd who gives them the full story. Ellen hears Tony making fun of Tedd, and she threatens him. She then insults the principal, and notices Sarah staring.
Sarah confronts Ellen, who breaks down, cries, kisses her, and runs away. Then the Goo from the first story, having regenerated and being more powerful than ever and can talk, attacks. Ellen saves Sarah, and Susan pulls an alarm to evacuate the building. Ellen gets Sarah outta there, and confronts the Goo ready and willing to sacrifice herself to destroy it. Grace and Greg arrive at the scene. Susan calls Nanase about it, saying she should help defeat it. Grace explains that a Tedd from an alternate universe named Lord Tedd is trying to kill all his alternate selves, and the Goo is his monster. Ellen finds out she can shoot a beam from her hand that stuns the Goo. After an infodump, Nanase and Greg join the fight.
Nanase tells Ellen the truth, that she won't die in a month. Justin and Susan (Who has summoned a katana) join the battle. Grace discovers she has telekinetic powers of some kind, and a powered up form. The Goo, scared by Grace, tries a smaller safer form. Ellen uses the opportunity to destroy the main body, then smashes the core. Mr. Verres gives Ellen a cover story and let's her live with Elliot, his parents accepting there new daughter easily. Nanase acts as Ellen's ambassador to everybody else. Ellen wants to start over new, as if she didn't have any of Elliot's memories. The Main 8 are together, and for the first time seem to act like a cohesive group. The End.
The Dunkels are the most unflappable characters ever made. They are completely calm and accepting about whatever is thrown there way, yet overreact on the small stuff.