Lego: Ninjago: The Son of the Hand of Time and Mistress of Imagination

In the short Time before Krux and Acronix betrayed the Elemental Masters, the older of the Time Twins, namely Krux, had a child with the Elemental Mistress of Imagination, this Child would inherit Both of his parents Elemental powers, Time and Imagination, respectively. This child would be kept hidden for many years, tutored by the finest teachers and Historians, and Trained by the World's greatest Martial Artists, Master Wu specifically.

This was all in an attempt to prepare for the war that would inevitably come when both Time Twins returned. But now, the Twins are Back together, and only this Unique Child can stop his Father and Uncle! His name is.............. John, in honor of his Grandfather.

However where does the big reveal happen, and in what Episode?