In the DuckTales (2017) episode 2x12, titled , the "helpful story" refers to the legendary tale of a golden robotic monster that Della Duck used to tell her sons.
While Della returns home, Donald accidentally ends up on the moon, where he is eventually captured by the Moon Dwellers. DuckTales 2x12
During the fight, Della's mechanical leg gets stuck, putting Louie in danger. She sacrifices the leg to save him, a selfless act that finally leads Louie to accept her as his mother. Episode Context In the DuckTales (2017) episode 2x12, titled ,