As established in The Lion King II: Simba's Pride, there was a whole sect of the pride who still supported Scar, led by the lioness Zira. These supporters were banished from the Pride Lands by ...

There she meets a lion cub named ... that Kovu is the son of Zira - a banished follower of the now-dead Scar. She plans to raise Kovu to overthrow Simba and become the king of the Pride Lands.