The Mutant Space Empire.

The mutant empire is fearless villians of this season. They are led by the evil Emperor Valcoon who serves under their real leader only known as "The Master". Just like the rangers, they too come from dimension x and comes to earth to destroy the rangers. But after learning about earth's treasures, they decide to stay and cause havoc. Alongside Emperor Valcoon is General Drapius, Lady of the mutants, Lady Juniper and cyborg mutant Sentana.