Anti-NMDA encephalitis is a rare autoimmune disorder that affects the central nervous system. We report a case of a 22-year-old male patient with a history of prodromal flu-like symptoms followed by brief aggression episodes, paranoid symptoms, and stereotypic movements. Routine blood work, a brain MRI, and an EEG were normal. Cerebrospinal Fluid (CSF) studies show no abnormality, and the neuronal antibody panel was administered. Antipsychotics and benzodiazepines did not have any benefits, and Electroconvulsive Treatment (ECT) was recommended for the ongoing symptoms of catatonia. Movement disorders and cognition gradually improved after the second session of ECT. Later, CSF study results demonstrated the presence of anti-NMDA antibodies, and standard therapy was administered. Our case suggests that ECT may be an effective treatment option for patients with anti-NMDA encephalitis. Further studies are needed to confirm the efficacy and safety of ECT in this patient population.