Animated sequels rarely work, and Happy Feet Two is business as usual. Unable to capitalize off its daring, rule-breaking predecessor, this one is as stupid as it looks, which is saying something.
Although there are token efforts to call back to the freshness of the original -- a couple scenes in which the computer-animated penguins are spliced into real-world footage -- the plot is a rehash of the self-actualizing message of the first film at its best. At its worst, it's an endlessly irritating succession of Alvin and the Chipmunks-style squeaky-voiced cover songs underlined with slapdash choreography.
Sidelines involving undersea creatures only detract from the main plotline, introducing unnecessary characters that are hard to care about.