Drek hired some elite bounty hunters. Defeat them and get to Gadgetron.
Get to the Gadgetron HQ is a mission in Ratchet & Clank (2016 game) taking place in the Gadgetron Headquarters, Kalebo III. After Ratchet failed to stop the the Deplanetizer destroying Novalis, he returned home to Veldin. Clank persuaded him to return to the Galactic Rangers to stop Alonzo Drek from destroying another planet, and he returned to a Class-g Star Jumper to hear out Elaris' plan. Her plan involved using a Hologuise to sneak aboard the Deplanetizer. In order to obtain it, they needed to travel to the Gadgetron Headquarters on Kalebo III, though they found it overrun by blarg.
The Sheepinator is available at the vendor for 40,000 bolts. If you have not already purchased the Glove of Doom, purchase it now, and purchase the Sheepinator later once you can afford it. Spend all Raritanium and then move on.
Head down the bridge to find several blarg elite commandos and bladeballs. Both enemies can be defeated with the Buzz Blades on both with added firepower from Mr. Zurkon, though a combination of other weapons can also be effective. As you head down, blarg bombthrowers will also appear along with a blarg armored transport; you do not need to destroy the dropship yet, but do destroy the bombthrowers with ranged weapons. Hit the green button and head inside the lobby.
The path here forks, leading to two missions: the story mission "Find the Focus Lab" on the right, or the optional "Ride the grindrail" on the left. "Ride the grindrail" is a very short detour, so you may wish to complete this first, and continue with "Find the Focus Lab" later.