The second Happy Feet plays after the events of the first movie but can be watched independently because not a lot of the events of the first movie are referenced. The story has similarities to the first one in the aspect that a kid is different than the others and wants to find his purpose. But it's not clear if this is the main storyline because even though it's a significant part of the first half, the second half of the movie is about the catastrophe which hit the colony and the first part is fewer referenced after that. Besides that, throughout the movie, a side story was introduced of the couple of krills who separated themselves from the swarm and wants to evolve to be from the bottom to the top of the food chain. The story is varied but is at some parts boring and foreseeing and is only kept interesting because of the changing storylines.

The animations are better than in the first movie. It's much more enjoyable but not too different from the first movie to give it a different look.

For kids, it's a great movie but there are better ones out there. I probably won't watch it again, but I'm also not in the target audience.