When a green ogre named Shrek discovers his swamp has been 'swamped' with all sorts of fairytale creatures by the scheming Lord Farquaad, Shrek sets out with a very loud donkey by his side to 'persuade' Farquaad to give Shrek his swamp back. Instead, a deal is made. Farquaad, who wants to become the King, sends Shrek to rescue Princess Fiona, who is awaiting her true love in a tower guarded by a fire-breathing dragon. But once they head back with Fiona, it starts to become apparent that not only does Shrek, an ugly ogre, begin to fall in love with the lovely princess, but Fiona is also hiding a huge secret.

Shrek has rescued Princess Fiona, got married, and now is time to meet the parents. Shrek, Fiona, and Donkey set off to Far, Far Away to meet Fiona's mother and father. But not everyone is happy. Shrek and the King find it hard to get along, and there's tension in the marriage. It's not just the family who are unhappy. Prince Charming returns from a failed attempt at rescuing Fiona, and works alongside his mother, the Fairy Godmother, to try and find a way to get Shrek away from Fiona.

When Fiona's father and King of Far Far Away passes away, the clumsy Shrek becomes the immediate successor of the throne. However, Shrek decides to find the legitimate heir Artie in a distant kingdom with his friends Donkey and Puss in Boots to be able return to his beloved house in the swamp with the pregnant Fiona. Meanwhile, the envious and ambitious Prince Charming joins the villains of the fairytales plotting a coup d'état to become the new king.

The once hideous ogre Shrek is now living a good life with wife Fiona and his three children. But he soon has a meltdown in front of them and his friends during his kids' birthday party. He suddenly wants to be a real ogre like he was before he ever met Fiona. So he turns to devious deal maker Rumplestiltskin for help. At first, Shrek lives the life he once lost and everything is good. But he soon finds out that he has been set up by Rumplestiltskin, who now rules the land with an ironed fist. Teaming with friends Donkey, Fiona and Puss in Boots, Shrek is in for the fight of his life as he tries to get his life back before time runs out.