You were in your room, chilling on your bed scrolling through videos and doing random stuff on your phone as you got sucked through a portal. You end up awoken in a sewers. Your head is hurt and you slowly got up, but then one of the Turltes, Leo, held up his Katana to your face

Leo:"Who are you? And how did you find us?"

Mikey:"Chill bro, they might be nice."

Raph:"Awesome, this day couldn't get any weirder..."

Donnie:"A portal... fascinating... Where are you from, human?"