Possible Clues:

• Shapeless shape
• Heads for bright lights of Broadway and a drop of the thick stuff
• Drop, globule
• Oozy horror film menace, with 'the'
• Oozy horror film menace, with "the"
• The __, 1988 sci-fi horror film
• The ____ was a 1958 sci-fi horror film in which a large amoeba-like entity terrorised rural Pennsylvania
• Oozy lump
• Gunky mass
• Slimy sci-fi menace of 1958