New Squid In Town! is the twenty-first episode of Season 4.
Mark uses his "image fake-i-fier" to look like a human and hides in Dimmsdale from Mandie, a homicidal alien princess girl whom his parents want him to marry. Mark soon finds adjusting to Earth proves difficult, as certain actions shortcircuit the device and reveal his true form. Worst of all, Mandie follows him to Earth, willing to make him marry her at any cost or kill him if she can't marry him.
This synopsis needs improvement.
The episode begins in the Yugopotamian Church,where Mark Chang and Princess Mandie's marriage is held. Queen Jipjorrulac is excited, and a bit scared. But right after the marriage formula, Mark flees from the church and goes to Timmy's class in Dimmsdale Elementary School; right after Timmy wished that everyone will freeze, Mark uses his Fake-i-Fier and Timmy helps him for being more human. But, at the school canteen,Mandie arrives and says to Mark that he must marry her with eating hot plasma menaces. Timmy re-wishes that everyone must freeze. At night,Mark hides in the city dump,and wrongly hugs Timmy. This makes Mark's Fake-i-Fier to discharge. And right after, Mandie arrives and she freezes Cosmo and Wanda in a block of carbonite. This makes Timmy and Mark flee with Mark's Yugopotamian ship. This makes Mandie get mad (her hair becoming a big flame and her fiery sword becomes stronger) and starts chasing them. Timmy has got an idea, which is to make Denzel Crocker be a Mark Chang copy with the Fake-i-Fier; so Mandie,believing he's Mark,takes him away. The day after, at the school, there's seen Chester, A.J. looking bad at Mark (even Timmy is seen, but not angry), which is rejecting some girls fell in love with him. Meanwhile in Yugopotamia, there is Crocker disguised as Mark and Princess Mandie's marriage. Right after Mandie's kiss, Crocker returns back to normal. This makes Mandie get angry, so she throws him right at Principal Waxelplax's house. This wakes up Waxelplax and upon seeing Crocker she grabs the hand dryer off her wall again and uses it to hit Crocker once again.