Who's the most awesome alien race in the entire universe?

Science fiction is full of alien races who kick all kinds of ass, including tough warrior races and highly advanced super-intelligent aliens. But who's the greatest race of all? Which race do you wish you could go spend a year or two living with? Who's most likely to conquer all other races in the multiverse?

Please include a picture or clip for your chosen alien race. And please mention the name of the race, where they appear, and why they are the best species anywhere. Thanks!

Top image: Liara T'Soni from Mass Effect, via JohnTesh