"Piper, Phoebe and Paige come to the aid of Mylie, a Mermaid-turned-human, when she shows up looking for their help after a pact she made with an evil Sea Hag begins to go drastically wrong."
"Piper, Paige and Leo struggle to convince Phoebe, now a mermaid, to come back to her life as a Charmed One, when she decides to "swim" away from her problems with Cole."
"Cole and Phoebe both fall under the spell of the Siren, who lures husbands to her and entrances their wives to follow with the intent to kill, leaving Piper and Paige to figure out how to save Phoebe."
"When a demon coerces a boy into turning him into an evil comic book villain so he can steal an Elder's powers, the boy transforms The Charmed Ones into comic book heroes with superhuman strengths to prevent this from happening."
"While seeking the advice of a fortune teller regarding her missing powers, Phoebe discovers in a premonition that a demon is going to kill them all after murdering the last one of the coven they were supposed to protect."
