Mace Windu vs Darth Sidious

This is the duel is right after revealing his true colours to Anakin in Revenge of the Sith.

Zuba vs Scar
Zuba fights Scar after Scar reveals his true colors to Bagheera.

Ironhide vs Megatron
Ironhide fights Megatron after Megatron reveals his true colors to Springer

Basil of Baker Street vs Scarface
Basil fights Scarface after Scarface reveals his true colors to Bambi

Baloo  vs Red
Baloo Fights Red After Red Reveals His True Colors to Dodger

Bagheera  vs Steele
Bagheera Fights Steele After Steele Reveals His True Colors To Kovu

Mufasa vs Panther King
Mufasa Fights Panther King after Panther King reveals his true colors to Bagheera

Superman vs Slade
Superman fights Slade after revealing his true colors to Robin

Easter Bunny vs Hans
Easter Bunny fights Hans after revealing his true colours to Kristoff.

Yoshi vs Bowser
Yoshi fights Bowser after Bowser reveals his true colors to ???

Simba vs. Scar
Simba Fight Scar After Revealing His True Colours to Jean T

Prince Eric Vs Zygon
Prince Eric fights Zygon after revealing his true colours to Flynn.

Danger Mouse vs Baron Greenback
Danger Mouse Fights Baron Greenback after Revealing his true colours to Basil

Danny Vs Lord Shen
Danny Fights Lord Shen After Reveling His True Colours To Simba

Tarzan Vs Clayton
Tarzan Fights Clayton After Reaveling His True Colours To Taran

Justin vs Fat Cat
Justin Fights Fat Cat After Reaveling His True Colouers To Baloo

Cobra vs Robert Callaghan
Cobra fights Robert Callaghan after Callaghan reveals his true colors to Aladdin

Aladdin vs Jafar
Aladdin fights Jafar after Jafar reveals his true colors to Cody

Jock Vs Niju
Jock Fights Niju After Reveals His True Colors to Pongo

Bagheera Vs Prince John
Bagheera Fights Prince After Reveals His True Colors To Mighty Mouse

Beast vs Zurg
Beast Fights Zurg After Zurg Reveals His True Colors to Eric

Kovu vs Joe
Kovu fights Joe after Joe reveals his true colors to Jaune Tom