Power Miners Power Miners is a theme released by LEGO in January of 2009 , and was discontinued in 2010 . It is similar to the Rock Raiders theme , and may be considered as that theme ' s spiritual successor . Short biographies for the crew , as well as the complete assortment of monsters — including the Crystal King — could be found on the " Power Miners " sub - site during the theme ' s run . These pages have since been discontinued along with the theme . Between 2009 and 2011 , two generations of the theme were released . The first is the 2009 generation , in which the Power Miners are deep in the crust of the Earth . In this generation , they fight the Rock Monsters , including the deadly Throwing Monsters and the powerful Crystal King . The Miners use plastic molds of dynamite , rather than a 1 - by - 2 plate with a dynamite printing as seen in Rock Raiders and other preceding sets . The 2010 generation charts that the Power Miners have drilled into the volcanic recesses of the Earth ' s core . The team faces the Lava Monsters , including Eruptorr , the king of the Lava Monsters . Instead of fighting the Lava Monsters with Dynamite — in 75 % of the sets , the miners do not — they use water cannons . Details . The theme is set in underground caverns — like the Rock Raiders theme — and the basic story involves a group of mining specialists called Power Miners . The team is sent underground to investigate what is causing a series of severe " earthquakes " responsible for the devastation of several cities on Earth ' s surface . While there , the Power Miners discover the Energy Crystals and the Rock Monsters . The team decide to attempt to collect and mine the crystals in order to stop the monsters from consuming them and causing more of the " rumblings " on the surface . The Power Miners are dressed in blue and gray clothing , and their vehicles are green and orange in a fashion similar to that of real - world mining equipment ; this is a fundamental difference between this theme and Rock Raiders , which is more futuristic . All of the theme ' s sets include at least one of the Power Miners and one of their vehicles , as well as one or more Rock Monsters , except 8962 Crystal King , which only contains the Crystal King himself and two of the miners with a small , hand - held drilling unit . As an exception , the two promotional sets , 8907 Rock Hacker and 8908 Monster Launcher , do not include either a miner — in the case of 8908 — or a Rock Monster ( in the case of 8907 ) . A Power Miners online game called " Rock Rocket " was released on November 28th of 2008 . Power Miners has introduced many new parts . Some of these are drills , special spiked wheels , Lava and Rock Monsters , and Dynamite that is three - dimensional as opposed to the more traditional 2 - by - 1 plate . This piece has also been used in Space Police III , Toy Story , and Agents 2 . 0 . The theme reprises several elements that were already present in the Rock Raiders theme ten years earlier , such as the occurrence of Rock Monsters and Energy Crystals . However , unlike in its predecessor , the Rock Monsters play a bigger role and are included in nearly every set . Additionally , each character — with the inclusion of the Rock Monsters — is named . Power Miners also implemented several features that only appeared in the planning stage of Rock Raiders , such as the concept of a mobile base and a common uniform for the miner minifigures . Factions . Power Miners . 2009 The eponymous Power Miners are a group of mining specialists who have a large variety of mining vehicles and equipment at their disposal , such as piloted bipedal robots and tracked vehicles . Most of the vehicles are equipped with drills and include elaborate gear mechanisms . The Power Miners have a large base — 8709 Underground Mining Station — and also a mobile drilling rig — 8964 Titanium Command Rig — which acts as a portable secondary base . The four main characters are : Doc , the leader of the team ; Rex , the engineer ; Duke , the mining veteran ; and Brains , the top scientist . In order to investigate the cause of several mysterious rumblings on the surface , the Power Miners were sent underground by the government , where they encountered the Rock Monsters and enigmatic energy crystals . The profile for Doc on the Power Miners ' website in 2009 mentioned a " Portal " , suggesting that there is a large hole leading into the underground . 2010 In the 2010 theme , the miners travel farther underground . They don new silver clothing and armour to protect themselves from the heat . They encounter Lava Monsters , and are equipped with mining vehicles with water cannons to fight the Lava Monsters . One of their lower bases is Lavatraz , for the detainment and containment of errant Lava Monsters . Monsters . Rock Monsters are the antagonists of the Power Miners and are included in almost every set . There are five different kinds of Rock Monsters — red , green , blue , yellow , and orange — that have been named . The first wave of sets contained only small versions of the monsters - Boulderax es are strong , slow , and dumb ; Firox es are sneaky and love to mess with the Power Miners ' vehicles ; Glaciator s are mean and very ill - tempered ; Sulfurix es can melt through solid rock to make their own tunnels ; and Meltrox es are very temperamental and destructive . The second 2009 wave introduced the Crystal King , and two larger versions of the smaller Monsters , Tremorox and Geolix . Both can throw the smaller Monsters , along with rocks . These latter two are larger iterations of Meltrox and Sulfurix , respectively . The Rock Monsters lack any vehicles or high technology . Their only equipment comprises of small catapults included in 8961 Crystal Sweeper and the Monster Launcher . Rather than being a serious threat , the Rock Monsters are portrayed as childish hoodlums in the videos on the LEGO website and they have silly personalities and a gluttonous nature . The larger Rock Monsters are more devious . Instead of being mischievous tricksters , they are sadists and bullies , throwing rocks and smaller Rock Monsters at the Power Miners and their equipment . Minifigures . In 2010 , a new type of monster was introduced - the Lava Monster . They live deeper underground than the Rock Monsters and they must be fought with water instead of fire , due to their heat - based nature . These Lava Monsters also have larger versions , like the Rock Monsters . New Parts ( Not including Minifigures and Accessories ) . Sticker Sheets . These parts are not actual parts ; rather , they are Sticker Sheets that are sold in most LEGO System sets . They include : Minifigures . Miners Rock Monsters Lava Monster s Media . Videos . The Power Miners teaser trailer is a film introducing the Power Miners sets from the second wave of 2009 , such as 8962 Crystal King , 8963 Rock Wrecker , and 8964 Titanium Command Rig . In the video , the Power Miners chase a Meltrox that leads them into the Crystal King ' s lair . When Power Miners was first released , a Power Miners movie was also released to promote the theme . These movies are no longer available , as the site has since moved off - line .