Shortly after Dru was born along with Felonius, his parents divorced as he was taken by his father (Robert) while his brother was taken by his mother (Marlena). Fritz came along with Robert & Dru Gru moving to Freedonia.
After they arrive at Freedonia, Robert Gru decided to be a supervillian called The Bald Terror. Eight years later, Robert teaches Dru to become a supervillain like him. After Robert's death, Fritz took care of Dru for the rest of his life. They arrived at Freedonia's First Annual Cheese Festival to check out the new cheese ray.