Destroy the Planetbuster

Destroy the Planetbuster was a mission in Ratchet & Clank. Ratchet and Clank found an Infobot with a recording of Drek gloating about the PlanetBuster Maximus, a massive missile made to destroy an entire planet into "sub-atomic particles". Angered by finally noticing Drek's true intentions, Ratchet and Clank reconcile some of their differences and agree to work together again to stop the weapon. Upon arriving in position to stop the ship they found it was about to leave, though Ratchet suggested they could use an old defense turret and stop it from departing.

Walkthrough
The Gadgetron vendor now sells the Drone Device, an automated defense system that targets some projectiles and enemies in close proximity to you. Follow the path to the right, encountering a few anklebiters, which mostly serve as fodder. A patch of trees hides an ambush by a large number of blarg troopers, but they otherwise provide no real threat. Another smaller group ambushes you from behind a stack of crates near the end of the path. To the right is a flying platform that leads to the path ending at the "Buy Hydro-Pack from Ed", ignore it for now and instead use the platform to the left.

A device in the floor will dispatch several faster and smaller type of Homing Mines while you are in its vicinity, destroy any that appear and run past it, encountering a Blarg Helicopter Commander that will begin to unload a barrage of rockets. The Devastator is recommended to bring him down. Take another platform to continue, encountering another group of troopers that rush forwards in an attempt to stop your progress. Another commander appears shortly after, after which you can use the wall to wall-jump to the jump to the top. Keep following the linear route, being careful of a conveyor belt that directly takes you into another Homing Mine dispenser, and a few anklebiters that hide within the snow of the second tunnel.

A trio of floating platforms will lead you to a large building, two troopers emerge from the entrance while a large group of them will wait inside. Once defeated, exit through the rear entrance and approach the Gun Turret. A lone commander will attempt to block your path, but likely proves futile. Once entered, the turret has to be used to shoot down the ship, which is protected by five turrets and a continuously respawning number of commanders. Focus on the latter, as the turrets do not focus fire on you, though simultaneously trying to hit the ship in the distance. Shooting each section enough causes it to blow up, leaving only the framework, up until it is destroyed entirely and crashes.