After the adventure with Bluey and opening Christmas presents with his sister Della. He was easily worn out so with that he went to their room, that's when he saw it. A note and his bed, since he was confused by this he read it by doing this change everything. He knew that if he didn't find it earlier, he couldn't imagine what would have happened, he did what first came to mind, hiding it so he did, it was his secret and no one knew about.
Years Later
Ever since that letter he was even more cautious than ever especially with Della he needed to make sure that she stayed safe no matter what. He knew what was going happen he tried with all his might to stop it and he never let his guard down. And that night came, that night that Della Duck would take The Spear of Selene. He didn't slept that night luckily since he didn't he noticed Della leaving the mansion so he followed her and stopped her from taking The Spear of Selene but it didn't went as planned.
As always Della was stubborn say that he didn't need to worried, that she be back in no time, she did whatever she could to convince Donald to let her take the wheel, she was able to get near the wheel and turn on the spear but not how it was supposed to. But not close enough to take the wheel completely, Donald mange to push her far from the wheel but it was too late The Spear of Selene was already started and going. Della froze she knew that no one was plotting the rocket but during this time put something on her and got her out of the rocket. With that Della return to reality she noticed that Donald didn't get out with her, her worried return luckily she landed safely, she went to look for Scrooge to know what happened she manage to find him. He was in his office and look like he been crying for hours, it took a while to find him but she was able to find him and that was what matter at the moment.
Scrooge was glad to see her again he also told her to never do that again and that was when she told everything. The happy moment end quickly after that Scrooge started crying with Della on what happened and was already regretting wanted to go to space from the beginning then that sadness turn to anger. She was angry at Scrooge for building that rocket and cause of that Donald was gone forever. She left that night with the eggs.