Super-Speed is a superpower used by Billy Thunderman (for the first three seasons), and Barb Thunderman (in Season 4) that lets the user move at a very fast speed. Billy uses this power to go to different places within seconds. When this ability is being used it would leave a blur behind them when they move.
- Billy used super-speed to search for Dr. Colosso, when he got stolen by Darcy Wong in Pretty Little Choirs.
- In You Stole My Thunder, Man, Billy superspeed to Russia to get the Russian plant for Phoebe and Nora to put in Max's food.
- Billy used superspeed to steal artwork for Max and Phoebe in Change of Art, making it look as if the Thunder Twins were good at art.
- Billy is the main user of Super-Speed because he is the only character to have this ability.
- In Thundermans: Secret Revealed, Barb gets Super-Speed when their powers are restored.