Disney Channel's premiere of The Lion Guard: Return of the Roar last week drew the biggest primetime cable numbers of 2015 in the kids 2-5 demo. The 44-minute pilot episode of the Lion King spinoff series set to premiere next year also was the No. 2 show overall in the target demo and the most-watched animated program across all kid-targeted cable nets with 5.4 million total viewers. Set to premiere early next year, Disney Junior’s The Lion Guard series introduces Kion…