Both are c. 1985 in lead pencil on vellum sheets. Both feature Captain Marvel followed by Captain Marvel, Jr. and Mary Marvel bursting through door of Doctor Sivana’s laboratory. Sivana is in another room about to use a detonator which will blow up dynamite strapped to a Sivana-like figure facing the Marvel’s. Larger sheet has 12x12” image area, signed in pencil “C.C. Beck” by the legendary Captain Marvel Golden Age artist at lower right. Second sheet has 11x11” darker image area and is unsigned. Both sheets have light handling folds as mailed. Larger sheet is Fine, smaller sheet is VF. Comes w/1977 newspaper article on Beck and NM soft cover First Edition of Price Guide with this art on cover. Guide has been signed in ink “Bob Overstreet” on title page. NM. Both preliminaries closely match finished cover. Great dramatic images. From the Robert M. Overstreet Collection. Comes w/COA.