Here's what should've happened if Sandy was involved in this.
When Sandy walked into the Krusty Krab, she saw everyone chasing Spongebob covered with fungus and the whole place is a mess. Sandy gets really angry and snaps her finger to stop the fighting causing it to explode in shock.
[the customers gasped]
Sandy: [scary, deep voice] YOU'RE GOING TO CLEAN THIS PLACE UNTIL IT LOOKS BETTER WHEN HE ARRIVED. THEN YOU WILL LEAVE, AND NEVER COME BACK!
Nat: [sarcastic] Or what?
[Then, Sandy angrily grabs Nat and stares with a deathly apparition of souls in her eyes. Nat then submits into cleaning while crying silently, and the others quickly join him]
Sandy: [normal voice] Where's SpongeBob? I wanna talk to him.
Mr. Krabs: You don't wanna know. [points to the door, where SpongeBob is heard softly crying]
Sandy: SpongeBob, are you okay?
SpongeBob: [crying] Don't look at me like that, I've got the ick!
Sandy: Don't worry, SpongeBob. It's not your fault.
SpongeBob: YES IT WAS! Everyone didn't help me at all!
Sandy: Whatever Squidward yapped about wasn't true at all. I didn't know this kind of fungus will tick off the whole town like that.
SpongeBob: What's the point? I can't show my face with my fungus over me again.
Sandy: Come out of there, SpongeBob. Come with me to the tree dome. I'll get you cleaned up.
[SpongeBob them opens the door and sees Sandy.]
SpongeBob: You remembered. Thanks for saving me.
Sandy: You're welcome.
Squidward: [whining] Are we done cleaning up yet?
Sandy: Less yapping, more cleaning, jerk!
To be continued... (For now.)