Sarah Thunder is the daughter of Johnny Thunder and Pippin Reed Thunder in Johnny Thunder and the Gift of the Nile and Johnny Thunder and the Wisdom of the Ancients. She is just as brave as her dad, fearlessly fending off Lord Sinister and his henchmen. She also has a gentler side, as she has a lot of patience.
- Film Credits: Johnny Thunder and the Curse of the Mummy (unreleased); Johnny Thunder and the Gift of the Nile; The First Mustache Maniacs Film Co. Fan Choice Awards (cut from film); Johnny Thunder and the Wisdom of the Ancients; Johnny Thunder and the Wonders Beneath the Waves (not yet released); Legends of the Universe (not yet released)
- Character Role: Love Interest; Sidekick
- Actor: Alyssia Derenski; An Pham
- Character Sex: Female
Sarah has brown hair worn in the style of a ponytail, with sideburns running down her cheeks. She wears a white button-up shirt, a blue necklace, and a brown belt on her body, with sand green pants covering her legs. When in the jungle, she wears a green overcoat for camouflage.
In cold weather, she wears a light blue sweater with dark blue scarf and white gloves. When she is diving, she wears a lime green and gray Deep Sea Salvage Crew diving suit, with lime green visor, sleeves, and flippers.
Sarah is a very caring and brave adventurer, just like her dad. She is willing to help out on any adventure, determined to make sure that Lord Sinister never gets away with the treasure. In Johnny Thunder and the Wisdom of the Ancients, she is dating Lance Spears.
- Sarah Thunder was a character invented back in 2002 for the short stories The Mummy's Tomb and Mummy's Curse. These stories later inspired the never-released film Johnny Thunder and the Curse of the Mummy.
- While she did not appear in Johnny Thunder and the Secret of Marco Polo, it was later explained that she was in college during the events of that film.
- Sarah Thunder is the only re-occurring adventurer that did not originate from an outside source.
- Her design pays tribute to the original 1998 version of Pippin, as her original head and jungle variation torso were re-used for this character.