Ultraman Tiga Episode 51

Just as Tiga destroys Zoiger, hundreds of other Zoigers come out of their prison in R'lyeh to ravage civilization. When Daigo and Rena return to base to prepare for the all-out battle, a malevolent darkness begins to engulf the world. The great evil that had destroyed the civilization Ultraman Tiga protected 30 million years ago has finally awoken to do it all over again. (Source: TV Tropes)