<P> The film was scheduled for a May 2009 release, but the release date was moved to March 27, 2009 . It was released on DVD and Blu - ray September 29, 2009, in North America . The film features the voices of Reese Witherspoon, Seth Rogen, Hugh Laurie, Will Arnett, Kiefer Sutherland, Rainn Wilson, Paul Rudd and Stephen Colbert . </P> <P> It grossed over $381 million worldwide on a $175 million budget and has a 72% approval rating on Rotten Tomatoes . Although not successful enough to be followed by a sequel, the film started a franchise consisting of a short film, B.O.B.'s Big Break, two television specials, Mutant Pumpkins from Outer Space and Night of the Living Carrots, and a television series with the same name . </P> <P> Susan Murphy (Reese Witherspoon) of Modesto, California is going to be married to news weatherman Derek Dietl (Paul Rudd). But before the ceremony, she gets hit by a meteorite and its energy causes her to grow uncontrollably during the ceremony . As a side - effect, her hair turns white . She is tranquilized by the military and awakens in a top secret government facility that houses monsters of which the public is ignorant . She meets General W.R. Monger (Kiefer Sutherland), the Army officer in charge of the facility, and her fellow monster inmates: Dr. Cockroach P.H.D. (Hugh Laurie), a mad scientist who became half - human, half - cockroach after an experiment; B.O.B. (Benzoate Ostylezene Bicarbonate) (Seth Rogen), a brainless, living mass of goo as a result of a food flavoring mutation; Insectosaurus, a massive mutated bug standing 350 feet in height, and the Missing Link (Will Arnett), a prehistoric fish - ape hybrid who was thawed from deep ice . Susan herself has been renamed to Ginormica . </P> <P> In deep space, an alien overlord named Gallaxhar (Rainn Wilson) is alerted to the presence of quantonium, a powerful energy source on Earth, and he sends a robotic probe to retrieve it . The probe later lands on Earth where the President of the United States (Stephen Colbert) attempts to make first contact with it . However, the attempt fails and the probe goes on a destructive rampage, headed straight for San Francisco . </P>

Who plays the general in monsters vs aliens