Trivia: What was the name of Walt Disney’s first cartoon mouse?
The correct answer is Mortimer
So why is this answer correct? : Walt Disney had a dream to create animated characters. After losing the rights to one of his first creations, Oswald the Lucky Rabbit, to Universal Pictures, he began brainstorming his next steps. This led him to a new character, a mouse whom he named Mortimer. By 1928, this mouse became Mickey, now the most famous mouse in the world and a symbol of the Disney brand.