|"Fear isn't a word where I come from!"|
|— Rufus reciting Fritz Donnagon’s catchphrase|
Rufus MacAllister (also known as Mother Doomsday) is a minor character in LEGO Ninjago: Masters of Spinjitzu. He works at the "Ninjago Doomsday Comix" store, where he assists customers with his vast knowledge of comic books.
When the Ninja were turned into kids due to the Mega Weapon, they realized that the Grundal had also been revived by Lord Garmadon's spell. They asked Lloyd for help, so he immediately brought them to a comic book store. There they met Rufus MacAllister (as Lloyd tells them, otherwise known as Mother Doomsday), a man who has knowledge of extinct or nonexistent monsters. He thought that their questions about the Grundal were theoretical, but still told them all he knew of the creature. He recommended using an illuma-sword to repel the Grundal, as it disliked light, but also stated that illuma-swords must be won in a comic book trivia contest.
Although Lloyd entered the competition, he hadn't read the latest issue of a sold-out comic book, which cost him the victory. At that moment, however, the Grundal appeared above the comic book store, forcing the Ninja to reveal that their questions weren't theoretical. The creature came crashing down in front of a stunned Rufus, and the Ninja grabbed the illuma-swords, but the weapons broke easily when they hit the Grundal with them due to them being props. As the Ninja immediately assumed they were doomed, Sensei Wu and Nya arrived, throwing the Tomorrow's Tea over to them and instructing them to use it in order to age the Grundle as well as themselves. Though the Ninja were hesitant at first, Lloyd is forced to use the tea.
With the Grundal gone, the Ninja are back to their normal ages, but Lloyd had grown as old as his teammates. Upon seeing his age difference, Rufus offered to give him a copy of the comic book Starfarer as a token of gratitude, though Lloyd declined, claiming that he knew how the book ends.
The Day Ninjago Stood Still
When a Stone Warrior attacked Ninjago Doomsday Comix, Rufus attempted to retaliate with an illuma-sword. His efforts were in vain against the enemy, forcing him to retreat with his comic books.
The Last Voyage
The Ninja were forced to leave Ninjago City, most of the team saying their goodbyes, though, Zane began feeling left out as he had no one in particular to wish farewell to. Sensei Wu pointed out to him the crowd of fangirls who excitedly surrounded the Bounty from the harbor, Rufus bursting out from them and admitting that he will miss the White Ninja.
The Corridor of Elders
Rufus helped the Elemental Masters defeat Chen's Anacondrai army at the Corridor of Elders.
- The back of his shirt says "COMIC MELTDOWN".