The Past Unmasked

The Past Unmasked (コルテックスの やぼう lit. Cortex Ambition in Japanese) is the boss fight and the final story level of Cortex Island (1996) and the thirty-fourth and the final main level of Crash Bandicoot 4: It's About Time.

Overview
Crash and Coco confront Doctor Neo Cortex for the second time during the game. Cortex has imprisoned his past self and enslaved the Quantum Masks to use them and Shoot-o-Matics against the bandicoots. The battle has five phases and in each phase, Crash or Coco need jump on or body slam the Shoot-o-Matics to destroy them, while avoiding electric waves and the effects of the Quantum Masks. When all Shoot-o-Matics have been destroyed, Cortex sends Lab Assistants to attack that the player must spin towards Cortex.

After Cortex is defeated for the second time, a few crates fall on his head and he passes out. Crash frees the past Cortex who goes to his lab to subject the past Crash to the Cortex Vortex, stating that his first order of business will be to dispose of the future Cortex. Crash rests on a eject button which causes the Cortex Vortex to break down, with Coco realizing this being the reason why the experiment failed in the first place. Akano drops on Cortex's back and the other Quantum Masks send Cortex to the end of universe. Cortex, now stranded in a desolate land with absolutely nothing, is a little bit sad for being alone but then is happy for getting peace and quiet. Dingodile reopens Dingo's Diner, while on N. Sanity Island, Crash, Coco and Tawna are playing video games.

Trivia

 * In this final boss battle, Cortex using all of the Quantum Masks to destroy Crash and Coco resembles The Wrath of Cortex final boss battle where Crunch and Cortex are using all of the Elementals to destroy Crash.
 * Cortex used the masks in order: Lani-Loli, Ika-Ika, Kupuna-Wa, and Akano.