What is considered the greatest sequel of all time?

I'm curious, what do you consider to be the greatest sequel of all time in the world of entertainment? Is it a movie that took the original story to new heights, or perhaps a video game sequel that surpassed the original in every way? And what sets this sequel apart from the rest, making it stand the test of time as the greatest of all? I'm eager to hear your thoughts on this intriguing topic.