" Plannet of the Jellyfish" is a Spongebob SquarePants episode from season eight.  In this episode, SpongeBob and Sandy battle an evil jellyfish who have cloned other Bikini Bottomites. 

And the characters in this film are:

SpongeBob SqurePants; Sandy Cheeks; Patrick star; and a lot more.( you can find it on the web so  I'm not tell much)

It's very interesting so the people evaluate it 5 stars.  And many critics comments that it's very good for the children and the teenagers. 

Summary, it's a good so if you have free time, you should watch it at home to relax after school, after a hard- working day