Episode 8 depicts the tragic transformation of Toya, Endeavour's eldest son, into the infamous villain Dabi. The episode delves into Toya's childhood, marked by his intense desire to earn his father's recognition with his powerful fire Quirk. His descent into darkness begins with neglect from his family and a catastrophic incident where his uncontrollable powers nearly cost him his life.

Toya's desperation reaches its peak when a crucial demonstration of his abilities goes unnoticed by Endeavour, leading to a dangerous overexertion of his Quirk. He barely survives thanks to Kyudai Garaki, who rescues him and medically alters him with the help of All for One. After a three-year coma, Toya returns home only to find his place in the family usurped by his younger brother Shoto, further fueling his resentment toward his father.

The story jumps to the present, where Dabi, now fully embracing his villainous persona, confronts Shoto. He reveals his ability to amplify his powers by leveraging his pain immunity, a dark reminder of his past traumas. Dabi's plan reaches its climax as he drags Shoto into a fierce battle, pushing his abilities to lethal levels.

The episode's climax shows Shoto developing his unique technique, 'Great Glacial Aegir,' to counter Dabi's fiery assaults. The episode ends dramatically with a massive explosion that freezes everything in its vicinity.