This is the last of the four SHREK movies, and it's a great conclusion of the saga.
Here Shrek lives a regular life with Fiona and their three sons, but every day is always the same again and again, and he is nostalgic of his good old days, when he was feared by everyone. After exploding of anger at their sons' birthday party, he is tricked by the evil Rumpelstilskin that makes Shrek signing a deal that he would have lived just a day like a real ogre.
At the beginning it's all OK, feared and hunted by everyone, but he soon discovers that he ended in an alternative reality, where he wasn't even born. Consequently Donkey doesn't know who is his best friend, Fiona never met him and Puss is fat. And, Rumpel rules supreme Far Far Away, with witches (and then the Pied- Piper) at his orders. Soon Shrek befriends a group of fighting ogres with Fiona as their commander, and with Puss and Donkey's regained friendship, they all fight Rumpel's kingdom and Shrek can share his true love kiss with Fiona, and the spell is broken.
This movie follows the footsteps of ''It's a Wonderful Life'', with Shrek in the James Stewart role, only in a darker way and with no custodian angels. And in the ending credits there is a brief summary of the previous three movies, with some scenes mixed with the names of the crew members.
The first Shrek was excellent (and I also wrote a long review on it), the second was funny and enjoyable, the third... I found it also amusing and funny, although it received poor reviews by different websites and newspaper critics, and this is also highly enjoyable.
The animation is always great in every detail, the soundtrack is always outstanding (and the movie ends with Weezer's cover of ''I am a Believer'', the hit song of the first movie), and the actors are, as always, well suited in their roles, especially Walt Dorn as Rumpelstilskin and Eddie Murphy as Donkey, my favorite character.
I recommend this movie to all fans of the series.