Unicron's core

While Primus is sometimes said to be the Core of the planet Cybertron, Unicron's core is the center of the Chaos Bringer, Unicron, acting as his brain, heart, and spark chamber all in one.

Sometimes, Unicron's core is also the inner core of Cybertron's moon. Other times, it's part of the Earth's core.

Fiction

The Transformers cartoon

Deep within Unicron, a bundle of monitors displayed Optimus Prime passing the Matrix of Leadership to Ultra Magnus. He seemed to be displeased by this turn of events. The Transformers: The Movie

Marvel The Transformers comics

While devouring the planet Ghennix, Unicron's core showed three individuals attempting to escape their fate, and an agent from a possible future that he desired to make his herald. All Fall Down

In an alternate 2005, Unicron witnessed Optimus Prime passing the Matrix to Ultra Magnus. The Planet-Eater!

Armada cartoon

Deep within Unicron, Sideways placed the Skyboom and Requiem Blaster inside Unicron's core processor, which allowed Unicron to partly shed his appearance as Cybertron's moon. Portent After acquiring the Star Saber, Sideways placed the blade in the core processor, which let Unicron shed the last of his moon disguise. Alliance

Optimus Prime and Galvatron managed to reach Unicron's core, when Sideways emerged from the glowing core processor within it. Unicron, speaking through Sideways, mentally and physically challenged Optimus Prime and Galvatron. The Autobots' human and Mini-Con allies arrived, and after a brief experience in a dreamworld, the Mini-Cons' combined strength helped free Optimus and Galvatron from being entangled in the core's tendrils. Sideways attempted to attack, but Optimus fired the Requiem Blaster, ending Sideways and Unicrons' schemes. Origin

Dreamwave Generation One continuity

As he devoured the planet Lithone, blank screens could be seen inside Unicron. Generation 1 #0

G.I. Joe vs. the Transformers

Traveling into Unicron, Flint and Cosmos reached Unicron's uniquely-human-looking brain, which they destroyed with a Metal-eating spore. Black Horizon, Part 2 of 2

Aligned continuity family

The Covenant of Primus

During the Expulsion of Unicron, Thirteen was micro-portaled into Unicron's body by Vector Prime, eventually reaching Unicron's spark chamber. With his unique spark, Thirteen attacked Unicron's Anti-Spark, sending Unicron into stasis. The Covenant of Primus

Prime Cartoon

Optimus Prime and Megatron, having battled Unicron's antibodies, made their way to Unicron's spark chamber. While Unicron attempted to defeat Optimus Prime with energy attacks and a possessed Megatron (via Dark Energon), Optimus Prime was successful in using the Matrix of Leadership to defeat the Chaos Bringer. One Shall Rise, Part 3

2005 IDW continuity

The core of Unicron was the black hole that Antilla once orbited. Having reached the core by following the activated Talisman as it burned through Unicron's body, Optimus Prime jumped into the black hole, entering infraspace. Later, after Optimus's encounter with Unicron's creator in infraspace, Unicron collapsed into himself, with his core - the black hole, serving as a dark star in Earth's Solar System. Ceremony

Gallery

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  Marvel animated film comic adaptation
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  Marvel US comics
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  Dreamwave Generation One
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  Universe (2003)
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  G.I. Joe vs. the Transformers
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  Prime cartoon
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  2005 IDW continuity