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However, Mumm-Ra returned for the 1989 season.

In the opening mini-series, Peter Lawrence's " Return to Thundera!

", the ThunderCats returned to New Thundera to rebuild their society, but before departing, they destroyed Mumm-Ra's pyramid.

This enraged the Ancient Spirits of Evil to the point that they brought Mumm-Ra back, and installed him within a new pyramid on New Thundera.

The season proved to be quite divorced from what had gone before, with adventures consigned almost entirely to New Thundera, and most villainous opposition coming from either Mumm-Ra or assorted new villains.

The Mutants, Lunataks and Captain Cracker all returned for one episode each, however.

In the series finale, several conclusions are reached: Mumm-Ra stands up to, and successfully asserts himself over, the Ancient Spirits of Evil ; the mystery of the Book of Omens was at last solved ; and the tumultuous and terrifying environment of Thundera was at last rendered peaceful and pristine.