A Dream Team is spectacularly good at what they do. They are the absolute, best-ever people in some field, gathered to tackle a problem. After all, if one person who's the best (or at least one of the best) at something is simply "great," then an entire team of them is even better, right?
To get a Dream Team, sometimes the constraints of time and space are relaxed. What if Sherlock Holmes, Ellery Queen, Nero Wolfe, Lew Archer and Lord Peter Wimsey teamed up to solve crime? Answer: detective Dream Team. What if Superman, Batman and Spider-Man teamed up to save the world? Answer: Superhero Dream Team (See I'm a Marvel... and I'm a DC for a version of this).
