Meanwhile, three hatchlings, one of whom is Terence and Matilda’s daughter Zoe, plan to act in a play

using three eggs at a beach, but the eggs drift out to sea by accident. They set sail to retrieve them, but

once they catch up to them, a whale blows them into a cloud. They manage to get them down after

inflating Zoe into the air but then misplace them again.

Chuck and Bomb ask Red to join in a speed dating activity, where he meets Chuck’s sister Silver,

an excellent engineering student, but she deems him incompatible. Red quits the meeting and Leonard,

the King of Piggy Island, comes to his house to negotiate. Red reluctantly agrees to build an alliance with

the pigs and they recruit Chuck, Bomb, Silver and Mighty Eagle. They hold a special meeting in Mighty Eagle’s

cave. When Red shows a photo of Zeta, Mighty Eagle behaves abnormally. The meeting is disrupted when an

ice ball hits Eagle Mountain and destroys it, but they escape just in time.

As the team travel to Eagle Island by submarine, Red assures the civilians they don’t need to evacuate.

Once there, Mighty Eagle confesses that Zeta is his ex-fiancée that he abandoned due to his cowardice,

retreating to Bird Island. Red insists on fighting alone and Silver decides to follow him.

They intrude the base from the mouth of the weapon only to be captured by the guards.

The other team members disguise themselves as a Trojan Eagle, grab a key card in a washroom,

and get into the base. The eagle guards are driven into a breakdance battle by the disguise’s

unusual movement, and the team find Red and Silver have been caught. They are forced to

escape when their disguise rips apart, but the guards are too busy dancing to notice.

The three hatchlings finally find the eggs on a small island, held by a python. They somehow defeat her

and plan to drift back to Bird Island, but they arrive at Piggy Island by mistake. They’re greeted by three

piglets and the birds travel by hot air balloon with the pigs.

As Red and Silver are confined in ice, Zeta tells them her plan to fire lava balls at Bird Island and Piggy Island,

as Red regrets telling the islanders to not evacuate. After she leaves to start the countdown, Red admits to

Silver that he put himself before anyone else as he’s afraid of not being liked if he’s no longer a hero.

Silver frees them both using her hair, reuniting with the team. Red gives up leadership to Silver,

who establishes a plan to destroy the weapon.

Silver and Red put themselves in an ice ball and roll on a rail towards Zeta’s superweapon, but the plan

comes apart and it misses the target, and the whole team are confronted by Zeta and her guards.

At this time, Mighty Eagle arrives to apologize to Zeta, but she quarrels with him, revealing his name

as Ethan and that she raised a daughter, her servant Debbie. While Zeta is distracted, Silver tells Chuck

to tie up the weapon using the super string she invented, which catches and decelerates the lava balls

after Zeta fires them. As the string breaks, the hatchlings and the piglets traveling above Eagle Island

help grasp it. The lava balls slide back into the weapon, destroying the whole base.

Everyone escapes, and Mighty Eagle protects Debbie from being crushed by a metal plate. Zeta shows

gratitude to him and they finally hold a wedding ceremony on Bird Island, with Red as the chief witness.

Everyone cheers Red for saving the islands, but he reveals Silver and the team deserves the real credit

instead of him, unveiling a Mount Rushmore-style monument to them. To his surprise, Red finds he is

beloved even more now because of his honesty and selflessness. The birds have a huge party to celebrate

while Red and Silver begin a romantic relationship, until Chuck arrives and interrupts the two.

In a pre-credit scene, the hatchlings put the eggs back home but three snakelets hatch. The injured

mother python comes and exchanges the babies with them, only for the three new hatchlings to drift

out to sea again, saying goodbye to their sister.