After Goku foiled the Red Ribbon Army's plans during his childhood, Dr. Gero created the Androids for the express purpose of exacting revenge.

Source: https://www.cbr.com/dragon-ball-z-androids-best-villains/

Android 18 is a beloved character in the beloved anime and manga series, Originally a human named Lazuli, she was transformed into a cyborg by the evil scientist Dr. Gero.

Source: https://gamerant.com/best-female-villains-anime-ranked/

Sophia Marrone had a goal and an assist for Gardiner (8-1-0), and Lydia Gero also found the back of the next.

Source: https://www.centralmaine.com/2023/09/29/local-roundup-richmond-boys-cruise-to-win-over-sacopee-valley/

The basketball court at Gardiner Area High School, then, is a place that will always be special to Gero for numerous reasons, basketball or not.

Source: https://www.centralmaine.com/2023/04/03/girls-basketball-britney-gero-takes-over-as-next-gardiner-girls-basketball-coach/

Using tiny drones, Dr. Gero studied the greatest fighters seen on Earth and collected DNA samples from them in order to create the fearsome androids with the goal of getting revenge on Goku.

Source: https://collider.com/dragon-ball-z-android-family-tree/