Adults have been spoilt in recent years with kids' films like The Incredibles and Ratatouille offering decent characterisation and dialogue as well as quality animation. Even the lower budget efforts like Planet 51 have provided a few laughs and a reasonable story. But Space Chimps 2 is truly dire. Maybe the original is better and this is a cheap cash in (a la jungle book 2, for example). Certainly if the original is as bad as this there should never have been a sequel.
The plot such as it is, involves a one-dimensional young hero monkey who accidentally (albeit very predictably) blasts off to the planet Malgor. Here he meets up with his Kilowatt, an annoying humanoid with big eyes who simpers platitudes throughout (think Amanda Seyfried in Mamma Mia only even more irritating, something I had not previously thought possible). Kilowatt has an enormous football shaped head, that is crying out for a good kicking from an early stage, but sadly this never materialises. Meanwhile on planet earth, the baddie from Malgor is stuck /petrified as a garden ornament (getting urinated on by passing dogs, the only time my kids laughed in the whole film). For some dramatically unconvincing reason he is suddenly un-stupefied and spends the rest of the film running amok in a generally unamusing way until turned into something 6 inches tall at the end, whereupon he is last seen being chased off by a dog. (Sadly not killed though, thereby worryingly leaving the option open for a third instalment of this franchise). Everyone else - including, sadly, Kilowatt - lives happily ever after.
Even my 5-year old was bored when we saw it at the cinema. Avoid like the plague