Transformers Energon/Awesome

Scorponok tries to use a sword formed from Megatron's own spark to put an end to him for good. It appears that he can't fight back on account of being a corpse stuck in a wall, but at the last moment, Megatron absorbs the sword back into himself, siphons energon from Unicron's own body, and bursts out of his old form in a kick ass new form. Then he proceeds to beat the living hell out of Scorponok, and then once he's a quivering heap on the floor, he effectively brands Scorponok with the Decepticon symbol.
A more subtle awesome would be Starscream kneeling and apologizing to Sixshot to spare Galvatron the humiliation of doing it himself, before Galvatron even has a chance to respond.
Demolishor knocking Megatron out of the way of the Energon Field, when he had previously doubted him.
Inferno fighting off Megatron's mind tainting power for several episodes, (failing eventually,), and eventually saving Starscream from falling into an Energon sun and sacrificing himself. And then he comes back, rebuilt as Roadblock, riding upon one out of many Energon Towers.
Black Unicron vs Optimus Supreme.
Team Ironhide creeping Kicker out with a Death Glare after (literally) kicking Ironhide around one too many times, someone had to call the guy out on that. Noticably this is also the final time in the series Kicker ever tries the crap again.
Scorponok's toy from this series was a masterpiece.