In a Dragon Ball GT episode, Goku employs a sword technique identical to the one Trunks used to defeat Frieza. This similarity underscores the shared mindset between Goku and Trunks. Interestingly, both characters independently conceived the same lethal strategy in GT, demonstrating their parallel thinking without mutual influence.
In Dragon Ball Z, Trunks unleashed a devastating attack that etched itself into history as his deadliest move, only for Goku to later adopt it in GT. Despite Goku's status as one of the universe's mightiest warriors, he occasionally borrows techniques from his Z-Fighter comrades, as revealed in a Dragon Ball GT episode where he appropriated Trunks' signature attack — the very one Trunks used to vanquish Frieza.
Trunks made a memorable debut in Dragon Ball chapter 331 by Akira Toriyama, arriving just in time to confront Frieza and King Cold's vengeful intentions towards Goku on Earth. Initially dismissed by Frieza, Trunks swiftly countered with a lethal display of swordsmanship, effortlessly cleaving through Frieza before reducing him to pieces.
The parallel surfaced in Dragon Ball GT's first season, episode 12, where Goku faced off against Mutchy in an alien castle. Cornered by Mutchy's minions, Goku seized a nearby sword and replicated Trunks' maneuver, intercepting attacks with precise slashes, mirroring Trunks' iconic technique.
Despite the striking similarity, the irony lies in Goku's ignorance of Trunks' original feat against Frieza, as their timelines diverge significantly. GT's Trunks exists in a timeline altered by Future Trunks' interventions, devoid of memories from the Frieza encounter. This disconnect underscores how Goku and Trunks independently converged on the same lethal technique, highlighting their shared warrior spirit.
While GT revisits Trunks' move after its debut in DBZ, it underscores the series' continuity shift from Toriyama's manga adaptation. Despite GT's lukewarm reception, it continues to explore new adventures for Goku and the Z-Warriors post-Buu Saga, paving the way for the subsequent Dragon Ball Super series.
For those interested in revisiting GT or exploring its unique storyline, all episodes are accessible on Crunchyroll, offering a deeper dive into Goku and Trunks' intertwined legacies in the Dragon Ball universe.