Scar (Jeremy Irons)’s Timeline and Summary

Scar refuses to attend his nephew's presentation ceremony.
Scar manipulates Simba into going to the elephant graveyard.
When Simba survives the elephant graveyard, Scar circles his wagons and enlists the hyenas in a murderous plot to kill both Mufasa and Simba.
Scar succeeds in killing Mufasa, but Simba remains alive. He sends Simba into exile, telling the hyenas to kill him.
Scar (really ineffectually) rules the Pride Lands for several years.
To Scar's shock, Simba returns to the Pride Lands.
Scar attempts to turn the other lions against Simba but fails.
Simba overthrows Scar, who is then eaten by a pack of ravenous hyenas.