The Soup Thickens was a limited time questline that was released on April 28, 2015 during the Terwilligers 2015 Event. It was the initial part of the Event's Act 2. Progressing through it unlocked the new Bob Clones (replacing the Mutant Vegetables) and the Herbicide Squirter.
Looks like all those mutant vegetables from Part One of this event are finally gone.
Yeah, but if I know anything about Part Two's, we're headed for a diabolical twist that will blow your socks off.
Ooooh!
Aaagh! Sideshow Bob... vegetables?
Mozart... Faulkner... HBO Dramas...
The town is full of mutant vegetables again, but now they look and sound like Sideshow Bob. We have to get rid of them!
You were right Lisa. It's slightly worse than Part One.
It's about the same but slightly worse!!!
The Soup Thickens Pt. 2[]
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Dialogue
Someone has created an army of Sideshow Bob mutant vegetable clones and sent them to kill me! But who?
It all comes back to Monsarno Research.
I have an interview there for a summer internship, but I can promise you, the interviewers won't be the only ones asking some tough questions!
The Soup Thickens Pt. 3[]
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Dialogue
So Sideshow Bob used to be Director of Research at Monsarno?
Yes, and a little of his DNA accidentally contaminated the new GMO vegetables we're creating.
A perfectly normal and predictable side effect.
Like Hell! This was all Bob's plan to kill me with these terrible clones.
I don't see how. They're very inoffensive, and they make an excellent soup stock.
I might die of how ugly they are to look at.
The Soup Thickens Pt. 4[]
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Dialogue
Stupid Sideshow Bob vegetables. I'm done being scared of you.
My days of hiding are done!
Bart, our court-mandated father-son time begins now.
My days of hiding start now!
The Science of Cooking[]
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Dialogue
Greetings, vegetable-embattled citizens of Springfield.
I am here representing Frink-Co, NOT a division of Monsarno.
We'd like to be one but they refused to buy us, nnn-hoyvin.
Our expert scientists, by which I mean me, have developed a potent herbicide that should nip this plague in the bud, which is exactly where it needs to be nipped.
Just sprinkle this on the offending vegetable and die it shall.
Afterwards, you can cook it -- the herbicide is basically MSG and Mrs. Dash.