Neil deGrasse Tyson floats through space as he explains many of our universe's phenomena. In the first episode, there's a really cool representation of how old our universe is in which major events in the past few billion years are squeezed into one calendar year. Neil walks around on the big calendar in the middle of space and shows how insignificant humankind really is in comparison to how long our universe has existed (this can be seen briefly at 2:41 in the trailer).
I also love the opening intro with the word COSMOS spread across a black hole/eyeball. The amount of time and work that went into creating this show certainly paid off.