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 human that is a homage to the original from the Transformers Animated continuity family.
"Sparkplug" should not be confused with
- Sparkabots, the Autobot subgroup from Generation 1.
- Other characters named Daniel Witwicky.