Ape Escape 3 is the third installment of the Ape Escape franchise, released on PlayStation 2.
The story begins when Specter, the Pipo Monkey's Leader, finds a Monkey Helmet, and hires the human scientist Dr. Tomoki to aid him in his evil plans. They establish TV stations protected by the Freaky Monkey Five where they plan to broadcast TV shows worldwide. The television shows that are broadcast on every television put every human except the twins, Kei and Yumi, their aunt Aki, and Natalie into a mindless trance. When Natalie informs Kei and Yumi that Spike, Jimmy and the Professor were all infected by the television show, they go out to catch the monkeys and thwart Specter and Dr. Tomoki.
Their mission was to go to every movie set and capture all the monkeys there and destroy the satellite there. Kei and Yumi easily capture White Monkey, Blue Monkey, and Yellow Monkey. When they reach the TV Station where Pink Monkey is, Satoru and Sayaka's attempts to capture her fail and she escapes. They manage to capture Red Monkey afterwards.
When they reach Tomoki City, Tomoki challenges them to a battle in his giant Tomo-King robot. Tomoki, after being defeated by Kei and Yumi, and being humiliated by Specter, lets them take his rocket to space to defeat his former partner. Once they reach Specter's outer space base of operations: Space Station SARU-3, they capture all the monkeys and deactivate the movie sets on their way to Specter. When they reach Specter, he tells them his plan about how he will use his space station to cut the earth in half and keep half of it for the monkeys (leaving the other half, originally meant for Tomoki, to the humans). Afterwards he gets in his new King Gorillac Mech and tries to activate his plan. He is defeated and the two escape from the satellite, leaving Tomoki to give his life to deactivate the Twin Heavens. He survives. After Specter is defeated, Pink Monkey releases him and the rest of the Freaky Monkey Five, leaving them to be caught again in extremely similar missions. To complete the game one hundred percent, all the four hundred and forty-two monkeys have to be caught, all the time trials have to be completed with a gold time, and all the items, CDs, Video Tapes (except 28), Car Skins, Genie Dance tracks, books, etc. have to be bought. The game holds a total of four hundred and thirty-four monkeys if the secret code monkeys are not caught.
- Kei is the main playable protagonist of Ape Escape 3. He is a typical overconfident hothead, and he wants to stop Specter.
- Yumi is the first and only playable heroine in the main series, and is one of the two characters you can pick to play as and she wants to stop Specter.
|Mesal Gear Solid||Super Monkey Throw Stadium||Ultim-ape Fighter!|
|Characters||Casi · Jake · Natalie · Professor · Specter · Spike|
|Gadgets||Dash Hoop · Magic Punch · Monkey Radar · R.C. Car · Sky Flyer · Slingback Shooter · Stun Club · Time Net · Water Net|
| || |
|Prehistoric Era/ The Lost Land||Fossil Field · Primordial Ooze · Molten Lava|
|Cenozoic Era/ Mysterious Age||Thick Jungle · Dark Ruins · Cryptic Relics|
|Dimension/Dimension X||Stadium Attack|
|Primitive Age/Oceana||Crabby beach · Coral Cave · Dexter's Island|
|Ice age/New Freezeland||Snowy Mammoth · Frosty Retreat · Hot Springs|
|Dimension/Dimension X||Gladiator Attack|
|Recent Past/Medieval Mayhem||Sushi Temple · Wabi Sabi Wall · Crumbling Castle|
|Present-Day/Futurama||City Park · Specter's Factory · TV Tower|
|Present-Day 2/Specter Land||Monkey Madness|
|Dimension/Dimension X||Peak Point Matrix|