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Stoneheart image.jpg

Stoneheart is an evil Rock Lord from the planet Quartex. Large, cruel and unpredictable, he is feared by all Rock Lords, good and evil. Even Magmar thinks twice about crossing him.

Which is probably why no-one's ever said anything to him about the lipstick.


Challenge of the GoBots cartoon[edit]

Voice actor: Foster Brooks

Stoneheart was part of Magmar's army. He was defeated, along with the rest of Magmar's troops by the combined forces of Boulder's tribe and the Guardians.Battle of the Rock Lords

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Machine Men mini-comics[edit]

After the Australian Army dropped a nuclear bomb on the Enemy Machine Men during a pitched battle on Earth the explosion awakened the Rock Lords, with Stoneheart among the first to break through the planet's surface. After Sticks and Stones spent too long arguing he grew impatient and shifted to rock form in order to bowl over the Friendly Machine Man Night Ranger. Challenge of the Machine Men

GoBots Magazine[edit]

Along with Magmar, Brimstone, Tombstone and Sticks'n Stones, Stoneheart helped corner Boulder's Good Rock Lords on a cliff over the Lava River. However, Nuggit arrived with the Rockasaurs, giving his friends an opening to fight back. Update from Quartex

Rock Lords mini-comics[edit]


After Magmar discovered the Cryon Ray he laid an ambush for Boulder and his troops. The ray immobilised Boulder's troops and they were imprisoned in a cage near Stonehead, with Sticks'n Stones and Stoneheart on guard. However, Nuggit had escaped and was able to project a beam that knocked the pair out, allowing the Good Rock Lords to get free. Boulder then shot everyone with his sword sic and the good guys escaped, leaving Magmar to swear revenge. Powerful Living Rocks Face a Deadly New Peril

Go-Bots comic[edit]


Stoneheart was one of the followers of Magmar in the forgotten "Heart of Gobotron" - i.e. Earth, and helped guard Skull Mountain. When a Go-Bot party searching for the Lazer Lance came close to Skull Mountain he joined Sticks'n Stones and Tombstone in attacking them, restraining Turbo. However, Boulder's Go-Lems saved the Guardians, with Nuggit grappling with Stoneheart.Issue 4


Rock Lords[edit]

Rock Lords Stoneheart toy.jpg
  • Stoneheart (Rock Lords, 1986)
    • Evil Rock Warrior
    • Rock Type: "Slate - a cold hard rock symbolic of Stoneheart's personality."
    • Accessories: Slam Ray
Stoneheart was released in the second series of Rock Lords by Tonka and converts from robot to slate rock in 8 steps. The figure was released in Japan as Amazon Rock, one of the Rock Robo in the Machine Robo: Revenge of Cronos toyline, with a different colour scheme - the Western version is darker, though you wouldn't really notice unless you had them side-by-side; it is unclear which was the original release. Stoneheart has excellent articulation, with movement at the shoulders, elbows, wrists, hips and knees.

Robo Machine[edit]

  • Stoneheart (Rock Lords, 1986)
    • Evil Rock Warrior
    • Rock Type: "Slate - a cold hard rock symbolic of Stoneheart's personality."
    • Accessories: Slam Ray

In Europe, Rock Lords was a subline of Robo Machine. Stoneheart was issued by Bandai in 1986 with no significant changes.


  • An early prototype for Stoneheart had a greenish tinge.
  • No known prototype corresponds to Stoneheart's animated color scheme. Weird.
  • Stoneheart's Japanese release, Amazon Rock, reveals the source of his design inspiration: the film Creature from the Black Lagoon was released in Japan as Dai Amazon no Hangyojin (大アマゾンの半魚人, "Fishman of the Great Amazon", as in the river where the Creature originates). Subsequently, Japanese media latched onto using the word "Amazon" in association with approximations of the Creature, such as "The Amazon" in the NES game Pro Wrestling and Amazon Rock. Helps explain Stoneheart's luscious lips, anyway!