THE GODFATHER

*The Godfather Part III NEVER HAPPENED.

STAR WARS

*The Star Wars Prequels NEVER HAPPENED.

*The Star Wars Special Editions NEVER HAPPENED.

INDIANA JONES

*Indiana Jones and the Temple of Doom NEVER HAPPENED.

*Indiana Jones and the Kingdom of the Crystal Skull NEVER HAPPENED.

ALIEN

*Alien 3 NEVER HAPPENED.

*Alien: Resurrection NEVER HAPPENED.

LETHAL WEAPON

*Lethal Weapon 3 NEVER HAPPENED.

*Lethal Weapon 4 NEVER HAPPENED.

SUPERMAN

*Superman 3 NEVER HAPPENED.

*Superman 4 NEVER HAPPENED.

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The following films never had any sequels:

*BACK TO THE FUTURE
*JURASSIC PARK
*JAWS
*ROCKY
*BEVERLY HILLS COP

There. Apply that to the movie world and all of these film series are much better off, in my opinion.