The squid's ink is said to only be able to be harvested by mermaids or the Dark One, Rumplestiltskin. Cinderella uses the squid's ink to magically and temporarily paralyze Rumplestiltskin. Captain Hook is briefly attacked by a giant squid, until it is slain by Hook's brother Liam.
- They are based on the giant squid from Twenty Thousand Leagues Under the Sea and the kraken from Norse Mythology.
- S3, E04: "Nasty Habits"
- S6, E06: "Dark Waters" (flashback)
- S6, E15: "A Wondrous Place"