What's happening?

The Transformers: 3x8

Dark Awakening

On the run from Galvatron, Spike, Daniel and several Autobots enter a mausoleum and find a surprisingly not dead Optimus Prime. This would be cause for great excitement among Autobots. Unfortunately, however, Optimus is really under Quintesson control and is being used in a plan against his friends.

The Transformers: Season 3 Episode 8
Sep. 30, 1986