Robin Hood: Ghosts of Sherwood (2012)

After Robin Hood strikes a deal with a sorceress, his life comes to a tragic end on the battlefield. Heartbroken, Marian and Little John embark on a desperate quest to revive Robin and his band of Merry Men. However, their efforts result in unintended consequences, transforming the legendary heroes into undead beings. Now haunted by these ghostly versions of their former allies, Marian and Little John must race against time to find a potion capable of liberating the tormented spirits from their sinister fate, all while evading the vengeful undead.