Two Wizards, A Scientist and the Parallel World

Set after Cursed Child, Albus and Scorpius are set to begin their 5th year at Hogwarts, but we're sidetracked upon seeing Mundungas Fletcher carrying a Time Turner, but then Delphini appeared, who wants the device. After a magical brawl that went awry, Albus and Scorpius ended up in a world similar to the Muggle world where they do not exist. Then a scientist appeared to aid them