Cashing in on director Larry Hagman's fame as star of Dallas, a canny distributor reissued Beware! the Blob (aka Son of Blob) with the come-on line "The Film That J.R. Shot!" Picking up where the original Blob (1958) left off, the film begins as the pudding-like goo thaws out and begins wreaking havoc on the civilized world. Steve McQueen, star of the first Blob, is understandably absent; this time the heroics are handled by Robert Walker Jr., who takes on the Blob himself when the local authorities fail.
~ Hal Erickson, All Movie Guide