Energon-axe
| This article is about Optimus Prime's melee weapon. For the Andalite Animorph, see Ax. |
The 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 recent rereleases and redesigns of Prime's toy have actually included the axe as an accessory, either replacing or covering a hand.
Fiction
Cartoon continuity
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
The Stargate Battles
Marvel Comics continuity

As they made their way to the Ark, Ratchet described the energon-weapon battle at "Boulder 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!
"Universe" cartoon
In a skirmish with Decepticons, Optimus Prime used his energon-axe to knock out Cyclonus. Fight for Energon
Prime continuity

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: The Official History of the War for Cybertron 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)
Toys
Transformers Collection
- Convoy (2003)
- This re-release of the original Optimus Prime toy had a new energon-axe accessory that plugs into Prime's wrist holes after you remove his hands.
20th Anniversary/Masterpiece
- 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.
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.
Merchandise
Heroes of Cybertron
- Optimus Prime with Plasma Weapon (2002)
- A modification of the first Heroes of Cybertron Optimus Prime, with the energon-axe replacing his right hand.
- Convoy Vs Megatron (2002)
- A Tokyo Toy Show exclusive that includes both energon weapons and normal hands for Optimus Prime and Megatron.


