Serpentra

Serpentra is a robot created by Lord Zedd to destroy Earth However, it was soon destroyed by the Power Rangers and served a role in "A Zeo Beginning, Part 1" and "Forever Red".

It was used by the Project Zorgo Leader to destroy the Ninja Fighters But, it goes haywire and knocks the Leader unconscious and goes on a rampage it destroys everything in site (including the Ninja Fighters' base) the Ninja Fighters are forced to team up with Project Zorgo to fully destroy Serpentra they don't destroy But, manages to send it back from wince it came.

After that, the Ninja Fighters repair their destroyed base.