20. Jar Jar Binks
Star Wars: Episode I - The Phantom Menace
He might have needed a slap, and his existence was not strictly neccesary, but the creation of Jar Jar Binks was still an impressive feat.
The issues came with the voice - simply annoying - and his childish nature, but the digital effects used to create a completely CG character were near-perfect. Lucas would later boast of using the technology to create thousands of Stormtroopers in the sequels to Phantom Menace, saving the hassle of building real armour. Peter Jackson, meanwhile, boasted of creating a million pieces of chainmail for Lord Of The Rings. And we all know which one people prefer to watch...