Without a doubt, this is the worst IMAX flick ever. It's basically a nonstop-rollercoaster-ride (literally not metaphorically, though), which will either make you throw up from motion-sickness (just like one of those stupid aliens featured in this mess) or bore you to death. The sorry excuse for a plot (badly designed Aliens mistaking an amusement park consisting of badly designed rollercoaster rides for the "Earth way of life" or something to that extent) can be called unfunny at best. The animation isn't all that impressive and gets tiresome after five minutes. A must-avoid!