The LEGO Power Racers subtheme of LEGO Racers was introduced in 2005 and focused on TECHNIC and System vehicles with various functions such as pull-back motors, falling apart on impact, or slammers which propelled it forward. Power Racers was discontinued in 2010 and consisted of 35 sets in total.
2009 LEGO Sets
In 2009, LEGO Star Wars celebrated its 10th Anniversary with the release of its 10th Anniversary sets. But even more important, LEGO celebrated its 50th anniversary of the LEGO Brick. A number of new themes were first introduced including BIONICLE Glatorian, Space Police III, Power Miners, Agents 2.0 and LEGO Pirates was re-introduced. Some themes that were retired in 2009 by LEGO included Mars Mission, the original and highly collectable Batman sets. Exo-Force and Belville where also discontinued in 2009.