Final answer:
The creature in Mary Shelley's 'Frankenstein' speaks the threat to Victor Frankenstein about being with him on his wedding night, signaling an intention to disrupt his personal happiness.
Step-by-step explanation:
The quote "remember, I shall be with you on your wedding night" is spoken by the creature in Mary Shelley's novel "Frankenstein". The creature is addressing Victor Frankenstein with a threat that signifies the creature's intention to overshadow and possibly disrupt the most significant and personal moment of Victor's life, his wedding night. In literary context, such a moment represents not just a union of two people but also the culmination of personal happiness, which the creature seeks to ruin as a form of retribution.