Before Future Trunks appeared and killed Frieza and King Cold, another character took care of them in Dragon Ball Z.
During this saga, Trunks, like other Z Fighters ... That version of Trunks came from a future where Goku died, and the Androids had taken over the Earth. With that future having been avoided ...
While fans now know Trunks as the future son of Vegeta and Bulma ... That was the same approach Toriyama took when writing the Androids’ Saga and Trunks introduction. Toriyama came up with ...