Sasha Pieterse as Rebecca Granger
| Witch | 17 | Mattheo's secret |
Benjamin Wadsworth as Mattheo Riddle
| Wizard | 17 | Becca's secret |
Emma Watson as Hermione Granger
| Witch | 17 | Becca's sister |
Rupert Grint as Ron Weasley
| Wizard | 17 | Becca's bestfriend |
Christian Coulson as Tom Riddle/Voldemort
| Dark Lord | 18 | Mattheo's brother |
Tom Felton as Draco Malfoy
| Wizard | 17 | Rebecca's enemy |
Richard Harris as Albus Dumbledore
| Wizard | 78 | Professor |
Maggie Smith as Minerva McGonagall
| Witch | 56 | Professor |
David Thewlis as Remus Lupin
| Wizard | 34 | Professor |
Robbie Coltrane as Rubeus Hagrid
| Wizard | 62 | Professor |
James Phelps as Fred Weasley
| Wizard | 18 | George's twin brother |
Oliver Phelps as George Weasley
| Wizard | 18 | Fred's twin brother |
Julie Walters as Molly Weasley
| Witch | 40 | Ron's mother |
Mark Williams as Arthur Weasley
| Wizard | 42 | Ron's father |
Gary Oldman as Sirius Black
| Wizard | 34 | Rebecca's uncle |
Alan Rickman as Severus Snape
| Wizard | 34 | Professor |