Sparkplug Witwicky is a recurring human character in the Transformers franchise, primarily appearing in the original 1980s animated series. He is the father of Spike Witwicky and serves as a mechanic and ally to the Autobots. Sparkplug provides technical assistance, repairs, and support to the Autobots in their battle against the Decepticons. His resourcefulness and courage make him a valuable friend, often bridging the gap between humans and Transformers throughout the series.