Air date: 2018-07-06

Runtime: min

Madison and Valerie are in trouble! Beatrice and Will must search for the Magic Mirror to find out what happened!

Air date: 2018-07-13

Runtime: min

Madison and Valerie face their sea monster kidnappers as the humans embark on a quest to find their lost mer-friends!

Air date: 2018-07-20

Runtime: min

Madison and Valerie must figure out what mermaid song will open the magic lock to the well of power while Jed pays some old friends a visit.

Air date: 2018-07-27

Runtime: min

Madison, Valerie and the sea monsters come up with a plan to get a whale song into the well of power while the gang lands in Indonesia to begin their search for the mermaids.

Air date: 2018-08-03

Runtime: min

Valerie must learn an ancient technique in order to open the octopus lock while Nat and Liam have to fight their way to getting the magic ring.

Air date: 2018-08-17

Runtime: min

Madison and Valerie must battle Ronan and Petromey to unlock the next stage of the well of power while Stanley and Will look for the ghost of a mermaid to help them translate the magic ring.

Air date: 2018-08-24

Runtime: min

The final lock has the Mermaids confused as the humans get closer and closer to finding the location of the lost Mermaids!

Air date: 2018-09-01

Runtime: min

United, the Mermaids, humans, and sea monsters figure our how to open the final lock on the well of power, but something goes wrong!

Air date: 2018-09-08

Runtime: min

The Mermaids, Humans, and Sea Monsters come up with a plan stop Will's dad from stealing the worlds magic!

Air date: 2018-09-22

Runtime: min

In the season 4 finale, the mermaids, humans and sea monsters must unite to stop the magic well from destroying everything in its way!