Super-Speed is a superpower used by Billy Thunderman (and Barb Thunderman - for a brief moment in Thundermans: Secret Revealed.) 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.
- When the Thundermans were eating dinner, Billy super-speeds to the fridge to get lemonade.
- Billy super-speeds to power up Max's machine.
- In Going Wonkers, Billy super speeds uncontrollably.
- On the new trampoline, Billy super-speeds on it in Thundersense.
- 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 super-speed to search for Dr. Colosso when he got stolen by Darcy Wong in Pretty Little Choirs.
- Billy used super-speed to steal artwork for Max and Phoebe in Change of Art, making it look as if the Thunder Twins were good at art.
- In Meet the Evilmans, Billy jumps at enhanced speed with the skipping rope.
- When Billy turns into a rat with the Animalizer, he easily wins rat races with Max's Band.
- Billy quickly hides the decoration due to them wanting the surprise party to be a surprise.
- In Phoebe vs. Max: The Sequel, Billy runs away so he won't take the superbug.
- When Billy creates a fake person called Luigi, he quickly changes outfits so he can be both Billy and Luigi in Exit Stage Theft.
- When Nora almost lasered Chloe with her Heat Vision, Billy super-speeds to shield Chloe from getting hit.
- In Thundermans: Secret Revealed, Barb accidentally gets super-speed due to the Power Swap.
- In Happy Heroween, Billy thinks his speed is faster than lightning but he gets proven wrong.
- In May Z-Force Be With You, Billy was unable to speed to Metroburg but his age affected his powers.
- Billy, in Rhythm n' Shoes, runs in two flashes.
- In The Thunder Games, Billy speeds upstairs in the Thundermans' Home to get a hat to tell the family his superhero name.
- Billy can quickly speed around the world in 1 minute.
- Since Billy speeds differently than other humans, his heart rate beats rapidly fast as shown in Paging Dr. Thunderman