DreamWorks Animation has just unveiled the full-length trailer for Monsters vs. Aliens, which is set for release on March 27, 2009 in conventional theaters and IMAX. This will be the first film released to utilize the Ultimate 3D format. Click on the player below to check out this new trailer for yourself.

When California girl Susan Murphy is unexpectedly clobbered by a meteor full of outer space gunk, she mysteriously grows to 49-feet-11-inches tall and is instantly labeled a "monster" named Ginormica. The military jumps into action, and she is captured and held in a secret government compound. The world learns that the military has been quietly rounding up other monsters over the years. This ragtag group consists of the brilliant but insect-headed Dr. Cockroach, Ph.D.; the macho half-ape, half-fish The Missing Link; the gelatinous and indestructible B.O.B.; and the 350-foot grub called Insectosaurus. Their confinement time is cut short however, when a mysterious alien robot lands on Earth and begins storming the country.

Monsters vs. Aliens opens in conventional theaters and IMAX on March 27th.