The Messenger of Allah; prophet Muhammad ( pbuh&h)stated:
Mahdi ( hgr) is of my off springs
His name and his sobriquet are as same as mine
He is the most similar person to me in morally and creation, among all people.
He will be occulted and sorrowful, and the communities will be misled at the time
Then, he will emerge like a meteor which lights up
There, he will go forward fast,
And fills the Earth with justice and equity, while it will be filled with oppression and tyranny.
One of the reason they liken the imam( hgr) to a meteoroid is that, his emergence will be sudden and rearview.