Energon-axe

This article is about Optimus Prime's melee weapon. For the Andalite Animorph known as Ax, see Aximili-Esgarrouth-Isthill.

Prime's got an axe to grind... right into Megatron.

The energon-axe (also energon axe) is an iconic weapon used by Optimus Prime whenever he needs a melee weapon. He retracts his hand, and an emitter for the energy axe projects the blade. Despite only using it when he and Megatron are fighting on a particular dam, it was a very memorable ability, so much so that later rereleases and redesigns of Prime's toy have actually included the axe as an accessory, either replacing or covering a hand.

Fiction

Generation 1 continuity family

Generation 1 cartoon continuity

The Transformers cartoon

When duelling Megatron on top of Sherman Dam, Optimus Prime used his energon-axe against the Decepticon's energon mace. Prime lost the fight when he was distracted by Spike Witwicky calling for help. More than Meets the Eye, Part 2

Japanese cartoon continuity

The Battle of the Star Gate

In the mid-1990s, Optimus Prime helped Professor Adle test-drive his new C-X drone in a mock combat session. When C-X ran out of control thanks to the interference of the time-travelling ghost of Starscream (yes, really), Prime was forced to unleash his energon-axe and chop the drone's head off. Divided Views

A little later, while investigating Decepticon-made earthquakes that were striking Japan, Prime engaged Megatron in combat on the bed of the Sea of Japan, and they battled with their axe and mace. Activation

Robotmasters online comic

By that axe, he rules!

While in a battle with Megatron and his time-displaced namesake, Prime's right hand was severed by the latter. Luckily, this didn't affect his ability to summon his axe, which he used to take down both Decepticons in one powerful swing. And Then

Mars Attacks: The Transformers

Yep, this Optimus has an energon axe as well, which he used against the Martians during a temporary Autobot/Decepticon team-up. Mars Attacks: The Transformers

Marvel The Transformers comics

As they made their way to the Ark, Ratchet described the energon-weapon battle at Sherman Dam to the Dinobots as a way to illustrate the difficulties the Autobots had in relaying their peaceful intentions to the humans. Decepticon Dam-Busters!

Henkei! Henkei! Bun Bun manga

While battling Megatron to save the life of his human ally Wataru Hoshinoumi, Optimus Prime busted out his energon-axe, but was bested by Megatron's energon mace. An energy boost courtesy of Wataru's energon-manipulating powers got him back on his feet, powering up his axe into a mighty sword that he used to cleave open Megatron's chest, winning the fight. Optimus Prime's Secret

Prime got his sword out again for a rematch with Megatron when the Decepticon leader was recuperating from his wounds in a bath of molten energon. Prime went so far as to stab him through the chest and break the sword's blade off inside him, but this only drove Megatron into a frenzy, leading him to use the energon to transform himself into Galvatron. Creation! The New Emperor of Destruction!! Galvatron proved virtually undefeatable, until a well-placed shot from Starscream re-opened his chest wound, allowing Prime to drive his sword into the gash and tear his opponent wide open. Revenge

Universe cartoon

In a skirmish with Decepticons, Optimus Prime used his energon-axe to knock out Cyclonus. Fight for Energon

2005 IDW continuity

Optimus Prime used his energon-axe to cut off Megatron's right arm during the battle for Sherma Bridge. Chaos Theory Part 1

Prime Wars Trilogy cartoons

Optimus Prime dueled Windblade, using his energon-axe to counter her sword. The Duel He later used his axe in an attempt to bring down Trypticon, though it seemed to have little effect. In Good Hands When he tried to strike Megatronus with it, his blow was easily negated and he was killed. All Things Must Pass

Star Trek vs. Transformers

After being wounded by Megatron's fusion cannon, Optimus attempted to form his axe to fight his foe but lacked the strength to fully materialize the weapon. Prime's Directive, Part Four

Transformers/Ghostbusters

When challenged to combat by the ghostly Megatron, Optimus Prime wired his proton pack directly into his systems, manifesting the protonic energy in his axe. Ghosts of Cybertron Part 4 Though the axe allowed Optimus to physically harm his incorporeal foe, the Prime sheathed the weapon when the tyrant possessed Ectotron, unwilling to harm a fellow Autobot. Ghosts of Cybertron Part 5

War for Cybertron Trilogy marketing material

The Energon axe was one of Optimus Prime's primary weapons. Earthrise webpage^[1]

Transformers vs. The Terminator

Upon being reactivated in the Ark, Optimus Prime unsheathed his energon-axe to duel Megatron only for his enemy to call a retreat. Enemy of My Enemy Part Two

During what would ultimately be the final battle of the Great War, Optimus used his axe to gouge a deep wound in Megatron's chest, one that the T-800 later exploited to detonate the tyrant's spark. Enemy of My Enemy Part Four

Energon Universe

Optimus Prime activated his energon-axe to finish Skywarp, only for his arm to be destroyed by human weaponsfire before he could. Transformers #3

Aligned continuity family

Optimus Prime used a double-headed axe since his days at the Hall of Records, learning to transform it from his body while learning to fight. Exodus He could charge it to blow open walls, and would leap into the air with it for finishing moves against Soundwave and Trypticon. Transformers: War for Cybertron (360/PS3/PC)

Later, during the evacuation of Cybertron, Prime lost his axe in battle. He created a holographic shrine in memory of his "old friend," which survived the bombardment of Iacon.^[2]Transformers: Fall of Cybertron

Dark of the Moon film

Dam? Bridge? What's the difference? Your face is mine!

Optimus Prime used an energon axe in his fight with Sentinel Prime. When Sentinel called in a squadron of Decepticon fighter ships to attack his former pupil, Optimus was forced to put aside his axe and sword and pull out his gun to fight them. After the fighters were destroyed, Optimus pulled out the axe again and re-engaged Sentinel. It was knocked out of his hand by his former teacher just before losing his right arm and sword. After Sentinel was crippled by Megatron, Optimus used the axe to destroy the Decepticon leader by decapitating him, after refusing his offer of a truce (knowing his true intentions). Dark of the Moon

Cyberverse cartoon

While fighting against a group of bug-like creatures, Optimus deployed his battle axe and, upon witnessing the lifeforms absorbing the weapon's power and thus learning of their dependency on the energon that they had come across, ordered the Autobots to fall back. The Journey

Games

Angry Birds Transformers

You left a piece out!

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Transformers: Devastation

During Megatron's attempt to cyberform Earth, Optimus wielded his axe in battle (until he gained access to more powerful equipment) to fight back the attackers. More powerful variants could be unlocked by massacring large amounts of Decepticons and Insecticons, and by getting lucky in the in-game store. Like every other weapon, its damage output could be increased with parts from other weapons, and it could be pulled apart to power up others.

Other than this iconic axe, the axe weapon class included similar weapons with various extra, often elemental powers, and even a weapon used by a different Optimus Prime. None of these weapons could be used by other members of the Autobot team, however. Transformers: Devastation

Toys

The Transformers Collection

Convoy (2003)
- Japanese ID Number: 0

The Transformers Collection reissue of the original Optimus Prime toy comes with a new energon-axe accessory that plugs into either of Prime's wrist holes in place of his hand.

More information on Transformers Collection Optimus Prime at TFU.info

Masterpiece

Masterpiece Optimus Primes (MP-10 and MP-1, back) and Hybrid Style Optimus (front)

Optimus Prime (2003/2004)

The energon-axe is again a hand-replacing accessory for 20th Anniversary Optimus Prime, cast in transparent orange plastic.

Convoy Complete Edition (2006)

Same as above.

Convoy (2011)

MP-10 Convoy is an all-new mold. He has a new-mold, soft-plastic, transparent orange axe that slips over his fist, and can store inside the trailer, regardless of which configuration the trailer is in. The axe actually consists of two pieces—the base and the rest of the axe—which tend to detach easily, with the result being that it can be quite difficult to remove the axe from the dedicated storage space in the trailer without just pulling the axe apart.

Convoy (August 31, 2019)

This new mold of Masterpiece MP-44 Convoy comes with a shorter version of his Energon Axe.

Robot Masters

G1 Convoy (2004)

Another clear orange axe that replaces Prime's hand.

G1 Convoy Limited Black Version (2005)

For this black repaint, the energon-axe was decoed in silver.

Classics

Optimus Prime (20th Anniversary DVD Edition, 2006)

In this redeco of 20th Anniversary Optimus Prime, the energon-axe remains the same.

Hybrid Style

Convoy (2006)

An energon-axe that plugs into the ball-joint socket intended for Convoy's many hands.

Dark of the Moon

Optimus Prime (MechTech Deluxe, 2011)

Deluxe Class Optimus Prime's MechTech weapon is a Blaster that converts into an Energon Axe.

Transformers (2010)

Masterpiece Optimus Prime (2012)

This Hasbro Toys"R"Us-exclusive release of MP-10 Convoy still has the Energon axe. It is unchanged.

Generations

Orion Pax (Deluxe, 2013)

Generations: Thrilling 30 Deluxe Class Orion Pax comes with his Energon Axe, which can peg onto 5mm ports on his hands and vehicle rear sides.

Orion Pax VS Megatronus (Multi-pack, 2013)

Same as above.