Sludge

Sludge is one of the Dinobots, a group of Autobots who transform into mechanical dinosaurs. Introduced in Marvel's early Transformers run, he takes the form of a brachiosaurus and fights alongside the Autobots against the Decepticons.

Stomping onto the scene in 1984's The Transformers #7 — a Bronze Age debut courtesy of Jim Salicrup and Frank Springer — Sludge has been a fixture of Transformers comics lore for over four decades and counting. A Marvel-era original, this character has shared the page with heavy hitters like Grimlock, Optimus Prime, Slag, Snarl, and Ratchet, placing Sludge squarely in the thick of the Transformers universe's most iconic early action. With 26 catalogued appearances spanning an impressive 1984–2025 run and at least one collector-significant key issue to their name, Sludge is a rewarding deep-dive for fans who love tracing the full sweep of Transformers comics history back to its Marvel roots.