After squishing their body into through the bookcase door, the eighteen body bros found a large empty space. But Ty had designed this addition to the house so that was like a pocket dimension--and one that only these guys knew about.
In the middle of the room was a pedestal with a large diamond on it. Ty explained that this was a device that allowed anyone who touched it to change their form at will--as long as a part of that person was touching the diamond. To help demonstrate, Ty began by using his power to unfused all eighteen of the guys from each other and himself.
With all eighteen teens back in their own bodies, Ty shut the bookcase door and stepped over to the diamond. When he got there, Ty transformed his clothes into a black body suit with gray highlights. Ty rested his hand on the diamond, concentrated, and mentally asked the gem to make his thought happen. In two seconds, the diamond was glowing, and then Ty glowed white. As the others watched, Ty's torso began to widen at the shoulders, into a triangle-like shape. Ty's head was widening as well, and suddenly split into two. The gem and Ty stopped glowing. He now had wider shoulders and two heads.
"Wow!" exclaimed Dustin.
"Can we use it to become anything?" Carl asked.
"Anything that any of you can think of," answered one of Ty's heads.
"Just make sure that you are making contact with the gem," explained the other head.
As soon as Ty finished, several of the guys began descending on the gem to try to transform themselves.