Although lightning-strike injury is uncommon, it is the cause of death in more people in the United States annually than any other natural disaster. Consequently, the emergency medicine specialist and intensivist should be familiar with the special problems of a lightning-strike victim. Lightning is a massive electrical discharge that results from a complex sequence of atmospheric events. When this massive electrical discharge strikes a human being, it causes predictable cardiac and neurological injuries. Synchronous myocardial contraction occurs at the moment of impact and is followed by a variable period of asystole. Prolonged asystole may cause ischemia and ventricular fibrillation. Alternatively, ventricular fibrillation may occur primarily if the electrical discharge strikes during the vulnerable period of the cardiac cycle. Unconsciousness, depression of respiratory efforts, and seizures are also immediate consequences of lightning strike. Respiratory arrest is presumed to be a consequence of inhibition of the medullary respiratory center. Retrograde and antegrade amnesia, confusion, disorientation, and vasomotor instability with transient paralysis of usually the lower extremities are commonly seen in lightning-strike victims. Other complications occur more variably, but should be carefully sought by the responsible clinician. These include burns at the exit and entrance sites of the lightning strike, eye injuries (e.g., cataracts, corneal lesions, intraocular bleeding), and rupture of the tympanic membrane. Besides describing the pathophysiology of these and other consequences of lightning strike, a comprehensive approach to the initial and long-term management of the lightning-strike victim is discussed.