Animated adventure based on the children's book by Berkeley Breathed.
When nine-year-old Milo (Seth Green) avoids eating his broccoli by feeding it to the cat, his mother (Joan Cusack) is not pleased. Following a sharp telling off, Milo wishes that he didn't have a mum and, in a peculiar turn of events, his wish is granted when she is abducted by Martians. The Martians, it transpires, are no good at rearing their young and need Earth mums to do the job.
Unfortunately, the process involves transferring their minds to nanny robots and disintegrating what's left. As Milo stows away on the spaceship that's transporting his mum to Mars, he finds himself thrown into an amazing interplanetary adventure.
On reaching the planet, Milo meets Gribble (Dan Fogler), a portly Earthling who has been stranded on Mars for 20 years, and Ki (Elisabeth Harnois) a sympathetic Martian with hippy tendencies, and with their help sets out to save his mum before it's too late.