The Deplanetizer is a giant laser space station in Ratchet & Clank, the 2016 re-imagined game, and movie. It is a blargian weapon created by Chairman Drek, used to destroy planets to aid with his goal of creating a new planet.
In the original game, the Deplanetizer was a simple platform-sized superlaser, and Drek's second attempt at a planet-destroying weapon, following the PlanetBuster Maximus. He attempted to use the planet to destroy Veldin, occupying the perfect orbit for Drek's new planet, ordered to be a foolproof plan in contrast to the PlanetBuster. Ratchet and Clank fought Drek over the weapon in his Ultra Supreme Executive Chairman Drek-Mech.
In the re-imagined game and movie, the Deplanetizer was instead a large space station, used by Drek from the beginning, with a design that resembles the original. This Deplanetizer was engineered by Dr. Nefarious to destroy planets and send harvesters to harvest the pieces of them in order to be used in Drek's new world. It functioned as Drek's base of operations, and was visited as a location several times.
Ratchet & Clank
Chairman Drek had commissioned a team of scientists to find the perfect orbit to place his new planet in. As the orbit was already occupied by Veldin, he then commissioned his scientists to find a way to destroy the planet. The first attempt at this was the PlanetBuster Maximus, built on Hoven. When Ratchet and Clank destroyed it, and Captain Qwark then failed to eliminate them in the Gemlik Base, Drek commissioned his scientists to create an alternative, which had to be foolproof.
On Quartu, Ratchet learned from an infobot that Veldin was the planet Drek intended to destroy, which enraged him. Ratchet and Clank chased Drek back to Veldin, and fought him in the Ultra Supreme Executive Chairman Drek-Mech in "Save Ratchet's planet". When the fight took them to the Deplanetizer, Drek revealed he had no interest in building a new home for his people, and merely wanted to profit from selling property on the planet. Throughout the fight, Drek activated three of the four power buttons used to start the superlaser to destroy Veldin, though Ratchet and Clank stopped them with the Thruster-Pack.
After the fight, the Deplanetizer flipped, and in a panic, Drek flew his mech up to his new planet. Ratchet and Clank used the Deplanetizer to destroy the artificial planet, though the debris caused them to fall almost to their deaths. Clank barely hung on, but Ratchet's weight damaged his arm, and the two nearly fell to their deaths, before Clank's Thruster-Pack saved Ratchet just before the fall.
It is unknown what happened to the Deplanetizer following this, but it was likely destroyed by the debris.
In Qwark's version of events, and the holofilm, the Deplanetizer was used by Chairman Drek from the beginning of his plan to create a new home for the blarg, New Quartu. The Deplanetizer, developed with the help of Dr. Nefarious, was used by Chairman Drek to destroy five planets in the Solana Galaxy, including planet Tenemule, with harvesters taking the pieces from the planet to use for New Quartu.
Chairman Drek later targeted Novalis, a populated planet. After the Galactic Rangers learned of this by interrogating Zed, Qwark instructed the Rangers to attack the Deplanetizer, though as was usual, did not develop a plan. When the Rangers asked what his plan was, Qwark claimed he would "reason with" Drek, and left the Rangers on his own. Following this, "Take down Victor Von Ion" commenced, in which Ratchet destroyed Victor Von Ion's warship. Worrying for Qwark's safety, Ratchet went into the Deplanetizer alone, while Victor attacked the Starship Phoenix in vengeance, to be defeated by Clank.
On board the Deplanetizer, Drek found Ratchet and captured him with a Mag-Net Launcher, and proceeded to justify his reasons for building a new home for the blarg. Ratchet then learned of Qwark's betrayal, as Drek sent him on an escape pod allowing him to witness Novalis' destruction. Qwark later confronted Drek about this, as Drek had promised not to harm the Rangers, and had not revealed Nefarious' involvement. Nefarious then used the Sheepinator to transform Drek to a sheep and eject him to New Quartu, betraying Drek and effectively taking over the blarg.
Later, the Rangers regrouped without Ratchet, where they learned that Umbris was the next target of the Deplanetizer. Due to Umbris' unstable core, its destruction would take the entire star system with it, and as such, it became evident that Dr. Nefarious was merely using Drek to cause destruction through means of vengeance against the Rangers for mistreatment. Elaris had a plan to use the Mag Boosters to knock the Deplanetizer off course, while Ratchet and Clank would infiltrate the Deplanetizer using a Hologuise to disguise as Qwark and sneak on for "Locate the Gravity Stabilizer", in order to disable it so that Mag Boosters would prove effective. After sneaking through the station, Ratchet and Clank hacked a terminal to locate the gravity stabilizer, though the Deplanetizer's warbots were then alerted to their presence. In "Head to the Core", they then fought through warbots to reach the gravity stabilizer and disable it.
After disabling the stabilizer, Ratchet and Clank encountered Qwark. After a battle against the captain, Qwark began to see the error of his ways and apologized for his mistake. Nefarious then attacked the trio, who tried to stop him from firing the weapon. While Nefarious successfully fired the weapon, the Mag Boosters prevented it from hitting Novalis, as he then engaged them in a battle. Nefarious was defeated, and Ratchet, Clank, and Qwark managed to barely escape the station before it crash landed on Umbris.
In the original release, the Deplanetizer is a floating dark red platform, with six cannisters surrounding it presumably used to hover. The superplaser itself is positioned below the platform, but can be flipped completely by hitting a beam in the center. It has four buttons surrounding it used to activate the countdown to fire the laser, and one button in the center on the platform used to disable the cannon. Surrounding it in between the four buttons are blue rails that the Grind Boots can be used to grind on.