Miranda awakens from her sleep, and she and Prospero go to visit Caliban, Prospero’s servant and the son of the dead Sycorax. Caliban curses Prospero, and Prospero and Miranda berate him for being ungrateful for what they have given and taught him. Prospero sends Caliban to fetch firewood. Ariel, invisible, enters playing music and leading in the awed Ferdinand. Miranda and Ferdinand are immediately smitten with each other. He is the only man Miranda has ever seen, besides Caliban and her father. Prospero is happy to see that his plan for his daughter’s future marriage is working, but decides that he must upset things temporarily in order to prevent their relationship from developing too quickly. He accuses Ferdinand of merely pretending to be the Prince of Naples and threatens him with imprisonment. When Ferdinand draws his sword, Prospero charms him and leads him off to prison, ignoring Miranda’s cries for mercy. He then sends Ariel on another mysterious mission.
On another part of the island, Alonso, Sebastian, Antonio, Gonzalo, and other miscellaneous lords give thanks for their safety but worry about the fate of Ferdinand. Alonso says that he wishes he never had married his daughter to the prince of Tunis because if he had not made this journey, his son would still be alive. Gonzalo tries to maintain high spirits by discussing the beauty of the island, but his remarks are undercut by the sarcastic sourness of Antonio and Sebastian. Ariel appears, invisible, and plays music that puts all but Sebastian and Antonio to sleep. These two then begin to discuss the possible advantages of killing their sleeping companions. Antonio persuades Sebastian that the latter will become ruler of Naples if they kill Alonso. Claribel, who would be the next heir if Ferdinand were indeed dead, is too far away to be able to claim her right. Sebastian is convinced, and the two are about to stab the sleeping men when Ariel causes Gonzalo to wake with a shout. Everyone wakes up, and Antonio and Sebastian concoct a ridiculous story about having drawn their swords to protect the king from lions. Ariel goes back to Prospero while Alonso and his party continue to search for Ferdinand.