In the television series Angel, the Tro-Clon is a "confluence of events" which would have great consequences of the destiny of mankind. Its arrival is announced in the Nyazian Scrolls.

It is initially assumed that the Tro-Clon is a single event or an individual, though it is soon revealed to be, in fact, a confluence of events that seemingly culminate in Season 4 of the show. The true extent of the Tro-Clon is never truly explained or shown.Wikipedia Tro-Clon on Wikipedia

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