Possible Clues:

• The __, 1988 sci-fi horror film
• The ____ was a 1958 sci-fi horror film in which a large amoeba-like entity terrorised rural Pennsylvania
• Gelatinous mass
• Drop, globule
• Ball possibly bowled prior to toss
• Score of zero, bowled with ball in high, slow arc
• Jiggly, oozy, slimy, ball of 53-Across
• Slimy menace of '50s horror
• Movie monster of the 1950s
• Slimy sci-fi menace of 1958