Wilson's disease (WD) is a rare inherited impaired copper metabolism with diverse clinical pictures dominated by hepatic and neurologic manifestations. We report the case of a 14-year-old female patient who attended the Department of Neuropsychiatry at Ali Abad Teaching Hospital, Kabul, Afghanistan, with generalized tonic-clonic seizure and cerebellar dysfunction. The patient was initially diagnosed as encephalitis and epilepsy and finally diagnosed with WD based on the clinical and laboratory findings. After 6 months of follow-up, the patient showed substantial clinical recovery.