The Return of the King is a subtheme of The Lord of the Rings that consists of 3 sets that ran from 2012 to 2013. Most sets were released in 2013 which accounted for 2 sets. As of today, the average annual growth of sets in The Lord of the Rings The Return of the King is approximately 12.3% per year.
Most valuable The Return of the King set
79008 Pirate Ship Ambush $815.01
Highest growth The Return of the King set
9470 Shelob Attacks +900.45%
The Return of the King was an unofficial subtheme of the LEGO The Lord of the Rings theme. It was introduced in 2012 and consists of three sets.
3 sets

79008 Pirate Ship Ambush

Theme / Subtheme The Lord of the Rings / The Return of the King
Year 2013
Pieces / Minifigs 756 / 9
Availability Retired
79008 LEGO The Lord of the Rings The Return of the King Pirate Ship Ambush
Retail $99.99
Value $815.01
Growth  +715.1%
Annual growth 19.5%

79007 Battle at the Black Gate

Theme / Subtheme The Lord of the Rings / The Return of the King
Year 2013
Pieces / Minifigs 656 / 5
Availability Retired
79007 LEGO The Lord of the Rings The Return of the King Battle at the Black Gate
Retail $59.99
Value $460.81
Growth  +668.1%
Annual growth 10.7%

9470 Shelob Attacks

Theme / Subtheme The Lord of the Rings / The Return of the King
Year 2012
Pieces / Minifigs 227 / 3
Availability Retired
9470 LEGO The Lord of the Rings The Return of the King Shelob Attacks
Retail $19.99
Value $199.99
Growth  +900.5%
Annual growth 14.0%