Stoneheart is an evil slate Rock Lord in Magmar's tribe. This gigantic rock-like alien from the planet Quartex and change into the form of a rock and can generate intense cold. His weapon of choice is his Slam Ray.
Stoneheart is the largest and cruelest of the evil rock warriors. He takes special delight in teasing his enemies before defeating them. Extremely unpredictable, Stoneheart's first loyalty is to himself, and even Magmar thinks twice about crossing him. Stoneheart fights like a raging beast, his Slam Ray hammering foes into rubble.
Stoneheart appeared in the 1986 film GoBots: Battle of the Rock Lords. He was voiced by Foster Brooks.
In the story Cultural Appropriation by Fun Publications it was revealed that Rock Lords Brimstone, Magmar, Spearhead and Stoneheart teamed with the GoBots Bent Wing, Major Mo, Raizor, Super Couper and Tail Pipe to explore Level 34 when the Cataclysm threatened to destroy the GoBots home universe.
Stoneheart was featured in the 2016 Ask Vector Prime story Echoes and Fragments, set during the events of The Transformers: The Movie. The manipulations of the evil Gong and Sideways resulted in various GoBots, Rock Lords and Starriors swapping places with characters during the events of that film.
Stoneheart was among Magmar's forces in "Update From Quartex" by Telepictures Publications in Winter 1987. In the story Magmar's forces attempt to force Boulder's troops into a lava river, but they are saved when Nuggit charges in with several Rockasaurs to help.
- Bandai Rock Lords GoBots Stoneheart (1986)
- A release of Stoneheart for in most of Europe by Bandai. Turns from humanoid to rock. Comes with his Slam Ray gun. The toy is identical to Machine Robo: Revenge of Cronos Amazonrock by Bandai.
- Bandai Rock Lords Machine Men Stoneheart (1986)
- A release of Stoneheart for Australia.
- Tonka Rock Lords Stoneheart (1986)
- A release of Stoneheart for the USA and England. Two package variants of this release exist.
- Rock Lords Coloring Book. Golden. 1986.
- Jim Sorenson (w). "Echoes and Fragments" Ask Vector Prime (February 10th, 2016), Fun Publications
- "Rock and Roll". Written by Jim Sorenson. Transformers: Renegade Rhetoric. November 28th, 1986/January 20th, 2016. No. 54, season 1.
- Paul Kirchner (w, a). "Update From Quartex" GoBots Magazine (Winter 1987), Telepictures Publications
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