The name Sparkplug has been applied to several different characters:
- Sparkplug Witwicky, the human ally to the Autobots from the Generation 1 continuity family. A.K.A. William, Irving, Daniel, or Danny, depending on the story.
- Sparkplug, the Mini-Con sportscar partner to Optimus Prime from the Unicron Trilogy.
- Witwicky Sparkplugs, a corporate sponsor for Mirage's Classics alternate mode.
- Sparkplug, the robotic dog and pet to Sari from the Transformers Animated continuity family.
- Sparkplug, the human that is a homage to the original from the Transformers Animated continuity family.
- Major Sparkplug, the Human Alliance partner of Whirl from Dark of the Moon.
- Sparkplug, the Rescue Bots faithful dog.
"Sparkplug" should not be confused with
- Sparkabots, the Autobot subgroup from Generation 1.
- Sparkdash, the Super-God Masterforce versions of the Sparkabots and Firecons.
- Sparkjump the Mini-Con from the Melbourne House Transformers PlayStation 2 game.
- Sparkbots, the tiny minions of Unicron from Kiss Players.
- Other characters named Daniel Witwicky.
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