Beware! The Blob (alternately titled as Beware the Blob, Son of Blob, Son of the Blob or The Blob Returns) is a 1972 sequel to horror science-fiction film The Blob. The film was directed by Larry Hagman. The screenplay was penned by Anthony Harris and Jack Woods III, based on a story by Jack H. Harris and Richard Clair. The film originally earned a GP rating from the MPAA, though it is now unrated.
Robert Walker as Bobby Hartford
Gwynne Gilford as Lisa Clark
Richard Stahl as Edward Fazio
Richard Webb as Sheriff Jones
Marlene Clark as Mariane Hargis
Gerrit Graham as Joe, Ape-Suited Party Guest
J. J. Johnston as Sheriff's Deputy Kelly
An oil pipeline layer named Chester (Godfrey Cambridge) returns to his suburban Los Angeles home from the North Pole, bringing with him a small sample of a mysterious frozen substance uncovered by a bulldozer on a job site. Prior to taking the blob to a lab to be analyzed, he places the storage container with the substance in his freezer, but he and his wife accidentally let it thaw, releasing "the Blob". It starts by eating a fly, then a kitten, Chester's wife, and then Chester himself (while he is watching a television broadcast of the film The Blob).
Lisa (Gwynne Gilford), a friend, walks in to see Chester being devoured by the Blob. She escapes, but cannot get anyone to believe her, not even her boyfriend Bobby (Robert Walker, Jr.). Meanwhile the rapidly-growing creature quietly preys upon the town. Some of its victims include a police officer and two hippies (Cindy Williams and Randy Stonehill) in a storm drain, a barber (Shelley Berman) and his client, transients (played by director Hagman, Burgess Meredith and Del Close), a Scout Master (Dick Van Patten), a farm-full of chickens, and a bar full of people (off camera).
At one point Lisa and Bobby find themselves trapped in Bobby's truck with the creature attempting to find a way inside. In the panic the truck's air conditioning is accidentally switched on and the Blob retreats, establishing its vulnerability to cold as in the original film (though the characters, also as in the 1958 original, do not immediately make the connection).
The now-massive blob then invades a bowling alley and a skating rink (consuming dozens more people in the process). It is finally stopped when Bobby activates the rink's ice mechanism, freezing it. While the frozen blob is being filmed by a television crew, one of the crew's bright lights is positioned on the ground, melting a small portion of it, which oozes toward the sheriff and envelopes his feet as he is speaking on camera. The movie ends with a cliffhanger, not knowing if the Blob is stopped, as it is about to engulf the local sheriff.