Norse sagas describe the berserkers as warriors who entered battle in a trance state, howling, biting their shields, and fighting with what witnesses called superhuman strength and no fear of pain. This film traces the evidence for who they actually were, from the axe-wielding fighter said to have single-handedly held a bridge against a Saxon army to the theories historians have floated to explain the trance itself: ritual, group psychology, and the possibility that hallucinogenic plants or fungi were involved before combat. Historians and archaeologists work through saga accounts, burial finds, and the physical plausibility of fighting in that state, weighing genuine intoxication against practiced performance and battlefield myth-making. The film treats the berserkers as a real, documented part of Viking-age warrior culture rather than a legend, tracking how they were recruited, how kings used them as elite shock troops, and why the trance eventually got them outlawed. It stays grounded in what the written sources actually say rather than romanticizing the drug angle.