Yes, Goku eventually learns and understands that he was responsible for his Grandpa Gohan's death. This pivotal realization occurs much later in his life, specifically during a critical battle.
The Revelation of Truth
For many years, Goku remained completely unaware of the true circumstances surrounding his beloved adoptive grandfather's passing. Grandpa Gohan had always told him that a monster appeared during a full moon and killed him. The truth, however, was a tragic accident: Goku, in his uncontrolled Saiyan Great Ape (Oozaru) form, had unknowingly killed him.
The shocking revelation comes to light during Goku's intense battle against the Saiyan Prince, Vegeta, early in Dragon Ball Z. When Vegeta himself transforms into a monstrous Great Ape by creating an artificial moon, Goku directly witnesses the immense power and destructive potential of this form. This experience triggers a series of memories and connections for Goku, allowing him to finally piece together the events of his forgotten past.
How Goku Realized
The critical clues that led to Goku's understanding were:
- Witnessing Vegeta's Transformation: Seeing Vegeta transform into the enormous, destructive Great Ape was a direct visual and emotional parallel to his own past.
- Connecting the Pieces: Goku's tail was his weakness, and he knew he'd lose control in this form. Vegeta's transformation clicked with Grandpa Gohan's story of a "monster" appearing on a full moon.
- The Emotional Impact: The sheer power and mindless rage displayed by Vegeta in his Oozaru form made Goku understand the extent of his own unconscious capabilities as a child.
Overcome with a mix of sorrow, regret, and profound understanding, Goku apologizes to his grandfather in that very moment. It marks a significant emotional turning point for the innocent Saiyan, finally understanding the heavy burden of his unintended actions.
Why Goku Was Unaware
Before this realization, Goku's lack of knowledge wasn't due to malice but rather the inherent nature of the Great Ape transformation itself. When a Saiyan transforms into a Great Ape without proper training or control, they lose their rational mind and often have no recollection of their actions in that state. This innate Saiyan trait ensured that Goku genuinely had no memory of the event.
Summary of Goku's Realization
| Aspect | Detail |
|---|---|
| Cause of Death | Goku, in his uncontrolled Great Ape form, accidentally killed Grandpa Gohan. |
| Goku's Awareness | Unaware for many years due to memory loss during transformation. |
| Moment of Truth | During the battle against Great Ape Vegeta in Dragon Ball Z. |
| Goku's Reaction | Expressed deep sorrow, regret, and an apology to his grandfather. |
This event highlights the tragic irony of Goku's early life and adds a layer of depth to his character, demonstrating his growth from an innocent, amnesiac child to a fully aware and remorseful hero.
