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There is a sense in which the period between the end of the Beast Era and the opening of the first
Transformers live-action movie in 2007 has become a "forgotten era" of the franchise. This is a bit of a pity, because it obscures the fact that this era introduced new worlds and concepts to the mythos. Before
Cybertron, for example, the only worlds that played a significant part in the Transformers franchise (that is, outside of one-off episodes and stories) were Earth, Nebulos, and Cybertron. The
Cybertron storyline started off by introducing three more, one of which was Velocitron, the "Speed Planet," from which we get Clocker.