Transformers: The Headmasters
Following on The Return of Optimus Prime (and in place of The Rebirth), The Headmasters is the first Japanese-exclusive Transformers franchise.

With Death Towers all over the planet releasing energy that threatens to tear the Earth apart, everything comes down to a climactic battle between the assembled forces of the Autobots and Decepticons at the North Pole, where Fortress Maximus and Scorponok have their final showdown!