While many of the movies are rather detached from the main plot, Cooler's crusade against Goku and Earth is a direct consequence of Frieza's defeat by Goku (and subsequent death at the hands of ...

As translated by @/Venixys on X (formerly Twitter), Kondo discussed the creation of Cooler, Frieza's older brother, for the 1991 animated movie Dragon ... Frieza and Goku on Namek that led to ...