Many wonder how Zuberi came to be. Well, there was a side effect at the Torchwood hub in Cardiff. Suddenly due to the mistake of a certain time-dragon, all the cuteness of the universe was being withdrawn into Thabo and he regenerated into Zuberi.
Ever since, time has been fractured, so it might be that you encounter multiple timestreams at the same time. Its really quite timey wimey wibbly wobbly
Starring Thabo, Zuberi, and Rin The Dragon