Jafar comes for revenge on Aladdin, using a foolish thief and Iago's treachery to find a way back into power.
 
Even without Robin Williams as the voice of the genie the film is enjoyable.  Kids don't care who is the voice of their favorite characters.  Plus, the movie checks all the four "F's" - Fantasy Fun For Family.
 
FUN FACT:  Robin Williams provided the voice for the Genie, at union scale rate (the lowest legal pay rate a studio can give an actor), on the provisos that his voice was not used for merchandising (i.e. toys and such), and that the Genie character not take up more than 25% of the space of a poster, ad, billboard, or trailer. When these wishes were not granted, he withdrew his support for Disney and the film. As a result, his name was not included in "The Art of Aladdin" book (it makes constant references to "the voice of the Genie"), and he was not available for the direct-to-video sequel Aladdin 2: The Return of Jafar (1994) or the Aladdin (1994) TV show (Dan Castellaneta filled in as the voice of the Genie for these productions). In an attempt to get back on good terms with Williams, Walt Disney CEO Michael Eisner apologized to him with a peace offering of an original Pablo Picasso painting. Still angered and feeling betrayed by Disney, Williams would not accept the gift. It was not until Disney chairman Jeffrey Katzenberg was fired and replaced by Joe Roth that Williams made peace with Disney. Through Roth, a public apology was given. Promises to right wrongs were kept, and Williams was so touched that he returned to reprise his role as the Genie for the second direct-to-video sequel, Aladdin and the King of Thieves (1996). Disney was so thrilled that they threw out the previously completed recording sessions with Castellaneta.