Castle is a theme that was introduced in 2013, succeeding Kingdoms. It features blue Lion Knights battling red Dragon Knights, and, with both historical and fantastical elements, will combine some aspects of its predecessors, Kingdoms and Castle (2007). It was discontinued in 2015 and was replaced by Nexo Knights in 2016.
Similarly to previous castle themes, the blue and gold lion crown kingdom, led by the heroic Lion king, seems to be the heroic side, as well as the defending kingdom. Most of their set are defensive items such as towers. The black and red dragon knights, led by the dragon wizard, are the rebelling or attacking faction and seem to be portrayed as the antagonists. Most dragon army items are attack vehicles, such as catapult wagons. Unlike their enemies, the dragon knights are more fantasy based, as not only is the dragon their namesake as in the Kingdoms theme, but they also have a Dragon in their control. Both sides are similar to the sides seen in the kingdoms theme, albeit with different coloring. The Dragon wizard is very similar in appearance to the Evil Wizard from the previous castle theme and Mallock the Malign from the Adventures of Clutch Powers.
- The two factions have the same animals as the forces in Kingdoms, but the Lions have a blue shield like the Lion Knights in Knights' Kingdom, along with a crown like the Crown Knights, while the Dragon knights are red.
- The Princess of this Castle Theme has a LEGO Friends Hair piece.
|70400||Forest Ambush||90||Lion Knight(2), Dragon Knight (2), Dog||$11.99 / €9.99||May 2013|
|70401||Gold Getaway||199||Lion Knight, Lion Knight, Dragon Knight||$19.99 / €19.99||May 2013|
|70402||The Gatehouse Raid||248||Lion Knight, King's Knight, Dragon Knight, Dragon Knight||$29.99 / €29.99||May 2013|
|70403||Dragon Mountain||376||Princess, Lion Knight, Lion Knight, Dragon Wizard, Dragon Knight||$49.99 / €49.99||May 2013|
|70404||King's Castle||998||The King , Dragon soldier (3)||$99.99 / €99.99||June 2013|
|850888||Lion Knight Battlepack||32||4||$14.99||2014|
|850889||Dragon Knight Battlepack||42||4||$14.99||2014|