Save Ratchet's planet

Save Ratchet&#39;s planet was the final mission in Ratchet & Clank. Ratchet was looking for the exact location of Drek's Deplanetizer, on his fleet, and found an Infobot containing an advertisement for Blarg TV. This revealed Drek was on Kyzil Plateau, prompting him and Clank to set out to finish it.

Once accosted personally, Drek reveals he intentionally polluted the blarg homeworld, all to force the blarg to pay for space on his new planet, for which he also had the intention to pollute it to repeat the cycle. Once defeated, Drek accidentally flipped over his Deplanetizer, followed by a panicked attempt to avoid being crushed, which let him to rapidly depart the planet, crash landing on his own instead. Ratchet followed up by firing the lethal weapon, which meant the final end for Drek and his planet.

Walkthrough
The mission will start by following the exact same path as seen in "Investigate crash site", with the extra addition of many elite blarg units. The most common are the blarg Elite Guard, which are relatively vulnerable after their attack has been dodged, sometimes accompanied by Armed Transports. Make sure to spend any remaining bolts on ammunition and any remaining available weapons that might yet be useful. Progress through the level, dealing with the horny toads as you go, while simultaneously watching out for any blarg opposition. Prior to reaching the crash site you will encounter a patrolling Rocket tank, a powerful tank that fires a near-continuous stream of rockets with excellent range. As with the prior blarg enemies encountered, trying to take it out at range with the Devastator or Visibomb Gun makes dealing with them easier.

After taking down the lone Transport behind it, use the Trespasser to de-activate the laser fence, followed by using the Magneboots to walk on the magnetic walkway that leads into a water basin. Restock on the Gadgetron vendor and then use the Hydrodisplacer on the Insta-Drain to empty the basin, whereafter you must use the Thruster-Pack's power slam feature to open a gate. You exit into a small cavern, occupied by horny toads, elite guards and a lone Rocket tank. After which you must trek across a series of metal platforms, while repeatedly fending off groups of enemies, making use of cover here a must.

Eventually you must use the Swingshot to cross a chasm, and use the Trespasser to unlock another Invinco-Lock. The area hereafter will give a short respite from the action, though it will not last long, as you will have to fight another group of elite guards, accompanied by an Armed Transport that drops them off. Swingshot across another chasm to come face to face with an army of elite guards and Transports, however, ignore these entirely and skip into the tunnel on the left.

Re-equip the Hydrodisplacer, still filled with water from the basin, and empty it into the Insta-Faucet. Swim through the now-filled basin to emerge back outside and in the vicinity of an Enlarging Machine. Use Giant Clank's fists to mash through the nearby walls that stands between you and the blarg army, crushing them entirely while you move to the final destination.

Ultra Supreme Executive Chairman Drek-Mech
Drek will be driving his own Ultra Supreme Executive Chairman Drek-Mech, but it proves to be of little use against Giant Clank. Simply smash it, or hit it with an energy bomb, to cause a short cutscene in which he returns Clank to his normal form. Drek will flee elsewhere, firing missiles at a series of floating platforms, that subsequently fail and crash if you land on them. Note the nearby vendor, allowing a final opportunity to restock if you do not have the Gadgetron Personal Delivery Assistant.

Drek will now alternate between firing missiles, with reticles on the ground marking their impact, and firing bombs that create a massive shockwave. The missiles are easily dodged by running away, and the bombs' shockwaves can be jumped over. Meanwhile simply keep chasing Drek, while firing at him as you avoid his attacks. One another part of his hit points has been depleted he will destroy the plateau on which the fight occurred, causing parts of it to sink and fall into the depths below. Continue chasing him to a new plateau. He will now also begin to deploy Homing Mines, which might limit your movement somewhat. His own bombs will clear the entire minefield however. Once another part of his hit points has been removed he will once again flee, to the Deplanetizer itself this time.

Drek will activate a timer, which you must terminate by using a power slam on the button in the center. Once done, he will surround the lower end of his mech with a ring of energy and proceed to try and hit you with it. His mech is too fast to avoid on-foot, but you can out-grind him with the Grind Boots and the grind rail surrounding the central platform. Aside from his missiles, bombs and mines he will also deploy Dark Gadge-Bots, which will chase and try to hit you.

Each time a part of his health bar has been removed he will activate the timer, which decreases each time, once two parts are left he starts to use the the larger electro cannon in his right arm. Its projectiles are quite fast and large, but can be dodged with a timed stretch jump. Once he only has one health bar left he will release a swarm of green missiles, that randomly embed themselves into the floor, and then explode. They will do this during the entire remainder of the fight and are unpredictable, but also too infrequent to be real threat.

Once defeated entirely, and after a cutscene, you must power slam a final button to activate the Deplanetizer and defeat Drek for good.