In Rama's epic, the main antagonist that kidnaps Sita is Ravana, the ten-headed king of Lanka. Ravana's abduction of Sita not only propels the plot but also introduces themes of good versus evil and the importance of dharma or righteousness. His character serves as a foil to Rama, highlighting the struggle between virtue and vice within the story. The confrontation between Rama and Ravana culminates in a profound exploration of loyalty, honor, and the battle to restore dharma in the world.