Season three of the original Transformers takes place after 'Transformers: The movie'. In that movie we see how Optimus Prime, leader of the Autobots died after a heroic battle. A real tearjerker, that moves any fan of the series.
And now he comes back as 'Optimus Zombie'. It seems one of the writers wanted a day of, and let his little nephew write an episode. Not only ruins the resurection of Optimus Prime the movie, it is also done in a blunt manner. Apparently the Quentessans (or whatever) put a few chips in Prime and he works again. Surely the Autobots would have searched the whole galaxy for a solution if they believed there was a way to bring Prime back.
Totally unoriginal, poorly executed and an insult to fans.
Oh, and why did they have to destroy the whole mausoleum? Now that I'm typing: why builing that thing somewhere in deep space and not on Cybertron or Earth? To keep it secret? Yeah right, that really worked out.