Monsters University is of course the prequel to the extremely popular 2001 Monsters Inc following the early days of Mike And Sully (voiced by Billy Crystal and John Goodman) as they meet at school and grow to become friends. Eventually.
The world established in Monsters Inc had left ample room for questions to be asked regarding the lore of this universe. For instance, if there are jobs specific to scaring, what qualifications are needed? What other jobs are available to monsters? How do they decide who gets to be a scarer and who works in support? And of course, there's the question of how a jock like Sully could be friends with a little dweeb like Mike.
All of that is answered quite wonderfully in Monsters University, which also adds new characters and some delightful jokes. But how well can you remember it all?