Hmm... Maybe these things could be likely to happen:

-SpongeBob FINALLY asks Sandy on a date(nervously), and she accepts, and Patrick tries to visit Princess Mindy(but learns he needs permission from her father to!).

-King Neptune considers retiring, as he's done all he could do, and now, Mindy has to fill his royal shoes, but it isn't easy!

-SpongeBob FINALLY passes his boating exam, and Mrs. Puff now FINALLY moves on!

-Karen breaks Plankton out of jail with some secret high-powered technology, and Plankton searches for another evil plot to destroy his enemies Krabs, SpongeBob, Squidward, and Patrick, BIGGER than ever! And of course, conquer Bikini Bottom!

-Patrick gets permission to see Mindy, but learns he has to live a royal life if he wants to marry her, leaving his life as Bikini Bottomite until he retires from his position!

-SpongeBob and Sandy enjoyed their time together, but they start to get into an argument(still don't know why), and so, they BREAK UP!

-Dennis, somehow, survived the boat that bumped into him, and now, his clothes are all torn, and he's back for revenge on SpongeBob and Patrick, searching desperately and dangerously for them, dealing with anyone who gets in his way!


And yeah, I like everyone's ideas, including SpongeBob/Sandy relationship(and I think a movie is the PERFECT way to reveal it!)! But what if Plankton had a sense for good in the end and decided to abolish all his evil ways? That's all my ideas for now. Sorry, I don't know anything for Squidward or Mr. Krabs at the moment.

Well, they would get back together at the end(many love relationships in movies are like that!).

And yeah, Mr. Krabs and Plankton should be "partners", but Plankton should double-cross him for overvaluing his vengeance on him! Probably in the end, though, he would be good.

Also, as an attempt to rule the world, I think Plankton would try to find out the secret passage to King Neptune's kingdom(WAIT, isn't it in ATLANTIS?! And King Neptune wasn't mentioned nor featured in that movie!), and try to take over it, as he would have all the power of the seven seas if he did(not to mention their magic), and he would do this by building a robot army(or army of something vicious and powerful) and invade their kingdom, destroying it and capturing everyone in it. Now that he has control of the kingdom, he will burn the Krusty Krab restaurants, thus leading Mr. Krabs to bankruptcy, all because of his traitorous partner! Plankton also destroys Bikini Bottom, capturing all the citizens(except for SpongeBob, Patrick, Sandy, Squidward, Krabs, and well, you get the idea; all the important characters stay), causing everyone including Sandy to be homeless, making the only restaurant available the Chum Bucket(all over the town), and making all the other citizens eat there for the rest of their lives!

I'm not sure what Plankton's REAL plot would be, but I think I picture him conquering Neptune's kingdom and destroying Bikini Bottom, and maybe perhaps forcing everyone to eat his food forever. I also picture Mindy's father being hurt at some point, oh, and Mindy is captured. I don't really picture Sandy being captured, though.

The main characters escape Bikini Bottom and go into some other town(not sure what town it is), and stay in a hotel together. Everyone's moping, crying, and everything, but SpongeBob suggests to look on the bright side, oh, and yeah, they ALL hate what Plankton did to them!

I'm not sure where Dennis comes in to attack the group(somewhere around here, I guess), but SpongeBob and his friends go out to rescue Mindy and defeat Plankton. Dennis would show up a few times in between here, and maybe there should be a scene where he's stuck with SpongeBob in the desert and it explains WHY he's pure evil(what drove him to this madness?), and maybe turn good towards the end, but get killed by Plankton while aiming to destroy SpongeBob. Mindy and all the citizens would be freed, and Neptune would probably be killed(hey, we need a good guy dying somewhere, right?) by Plankton. That would be sad, but in the end, Krabs tries to snap Plankton out of it, to stop ruining everyone's lives, to go back to the way things were supposed to be, fix his mess, and start over, as business partners again with him! Plankton agrees, and restores Bikini Bottom and Neptune's kingdom with the last magic he has left, and Mindy marries Patrick while SpongeBob marries Sandy. Patrick leaves Bikini Bottom to live with Mindy, but promises he'll revisit him again sometime, and SpongeBob goes off to Texas with Sandy(anything else would be dull). Mr. Krabs and Plankton are business partners, hiring new workers, and Squidward finally moves on with his life with his beloved and famous career. And NO, Patrick or SpongeBob is not going to think of a way they can be with their friends in Bikini Bottom AND with their wives! Doing that would make it like a Disney ending, and that would ruin it!

Hey, this would make a GREAT finale for the series, don't you think?

good ideas