The second season is less light-hearted, and explores less of the universe than the first. It starts with a narrow escape from Zarkon, and moves on from there primarily focusing on the need to defeat him. We get a little more character development, and the Paladins, must learn to connect further with their lions in order to defeat Zarkon.
Hey we are in a dire situation, oh wait, we have semi sentient magical lions that will suddenly have an ability appear that we didn’t know about just when we would need it… without having to work for it… That is not good story telling, and as a viewer it starts to become annoying. There is no sense of accomplishment in watching the Paladins gain the abilities, and at the same time there is no tension in the fights because you know that the magic spaceship lions will have a solution.
The second season is definitely more about the characters than the plot. Which ends up working because each of the characters in this show are great.