Don and Agent Weston of the NTSB investigate eyewitness accounts of a mysterious unidentified object flying dangerously close to downtown Los Angeles that has raised concern of a terrorist attack. After Charlie is recruited to help with the investigation, it is discovered that the flying object is part of a new technology that could revolutionize air travel. But the investigation takes a turn when they learn that the lead engineer is found murdered.
Plankton unleashes a new plan; to get the Krusty Krab to work 24 hours. SpongeBob thinks this is a dream, until he thinks he is being chased by killer Krabby Patties.
With the help of the avatars of the nebula, the Andromeda goes through the Route of Ages, back to the Known Worlds, and the Commonwealth.
Mr. Krabs is going to a naval reunion, but molts (leaves his shell) before he goes. He asks SpongeBob to go in his shell and imitate him for the reunion.
While traveling towards the North Pole, the group almost gets captured by the Fire Nation. However, when a charismatic young man and his band of rebels attack the Fire Nation camp and rescue them, they learn that they are trying to resist the Fire Nation’s motives to expand their territory. Katara and Aang really enjoy their time with the band of rebels, but Sokka soon discovers that they aren’t as noble as meets the eye.
Numbuh 5 goes to the planet Mars to pick up some marshmallows as part of dessert with her family after dinner. But upon her return, she discovers her family and friends are being menaced by an old foe who now is a mere shell of his old self.
When Mac accidentally imagines another friend, Bloo suffers sibling rivalry with the newly arrived and very odd Cheese.
The series concludes with the gangbangers taking out their assault on the 55th Precinct. After some grenade explosions, the precinct is destroyed. Cruz knows that Marcel Hollis is behind the attack, and she takes his life, as well as her own. Carlos proposes to Holly, and they are married. Everyone receives their reassignments, and Sully retires. In the last few moments, Sully narrates a look into the future.
Kibre prosecutes the man accused of murdering a transvestite, but she runs into trouble when his father confesses to the same crime.
Maddie has her prom at the Tipton Hotel after realizing there is nowhere else to have it. Zack thinks that he will be her date, but ends up getting dissapointed. Cody starts to act like a mime.
A xenophobic faction of humanity threatens to undermine talks to form a new coalition of planets.
Danny is skeptical when the pregnant girlfriend of his missing estranged brother, Rafael ""Rafi"" Alvarez, and mother of their 9-year-old son, tells him that Rafi has transformed himself into a responsible family man, who recently obtained a loan to open his own body shop. But Danny's investigation uncovers that Rafi has been seen with a convicted car thief, and the large sum of cash he'd been flaunting for his purchase of a body shop didn't come from the bank. Though Jack makes the point that Rafi may have legitimate explanations for the suspicious circumstances, Danny braces himself for the very real possibility that his brother may have put himself in harm's way.
Some castaways are reunited with loved ones; a strong alliance alienates one castaway, for whom immunity is the only chance for survival.
Sandy, Seth and Ryan travel to Miami to visit the Nana after she tells Sandy she is getting married. Unable to go because of work, Kirsten is left on her own to deal with her feelings for Carter. Trey misinterprets Marissa's friendship; Zach invites Summer to a home-cooked dinner.
Seth and Zach declare themselves rivals for Summer's affections; Marissa is still reeling from being nearly raped by Trey; Sandy confronts Kirsten when her drinking problem becomes very apparent; Caleb hands divorce papers to Julie.
When Grace convinces Karen to accompany her to her father Martin's birthday bash, the situation turns awkward when it is just the three of them. Struggling to gain the attention of her seemingly aloof father, Grace tags along with him to the golf range in hopes of scoring some quality bonding time. Meanwhile, Karen keeps herself entertained with Martin's buddy, Burt. Meanwhile, excited about the date that Jack has arranged for him, Will discovers the true meaning of the phrase blind date.
A man (Alan Rosenberg) whom Catherine flirted with at a bar reappears in her life as a suspect in a murder investigation.
In the sixteenth week of the Apprentice job interview, the final three candidates are faced with actual interviews - not by Mr. Trump, but by top executives from four of America's largest corporations.