The Old Future is a dark and desolate place. The Shadow Empire has risen. The Master League has been destroyed. The Dark Master has taken control of everything. Twenty-eight children, fourteen boys and fourteen girls (and six small robots, an obnoxious AI, a dark metal guardian of few words and a vengeful ghost), came back in time to prevent this apocalypse from happening.
They are:
- Carlos, son of Cilan
- Tor, daughter of Shaden
- Anakin and Zandar, sons of Ender and Xena
- Ria and Xici, daughters of Ender and Xena
- Grim and Joseph, Sons of Silas
- Ruth, daughter of Silas
- Kokiri, daughter of Nadine and Sonake(!)
- Sorid, Kokiri's shadowy guardian and best friend
- Pepsi, son of Mario
- Runner, son of Alex and Annie
- Robin, daughter of Alex and Annie
- Edison, an obnoxious AI who inhabits Robin's blaster.
- Crysor, son of Creep and Blaise
- Flare and Buzzsaw, daughters of Creep and Blaise
- Roar, son of Blaze
- Frosty, daughter of Frost
- James, son of Ellie and Jeremy
- Zelda, daughter of Ellie and Jeremy
- Serena, adopted daughter of Conner
- Edward and Georgie, sons of Conner
- Clarissa, daughter of Conner
- Cafaal and Guanhamara, children of the Dark Master who went rogue
- Janie and Jackie, twin daughters of Jason Woodspree and River
- JJX2-XT50, better known as Razor
- CTP-X90-CTR, referred to as Cetera
- J3-TTPR-9064, nicknamed Jets
- HP-YR310, who prefers to be called Hyperion
- 4W-Y15-BRU-69, who decides that he must be called xXx_SWAG_BOT420_BlazeIT_xXx (or just Swage)
- Nails, an inventor bot who set up the time portal with Kokiri
- Cypher, the ghost of a vengeful shadow warrior trapped in a cybernetic world