Ben, Maddie and the other humans deal with the fallout from the attack on the oil rig, while the mermaids reacclimate to their ocean home. Ryn comes back to land to follow through on an agreement she made with the military, despite not knowing what their ultimate goals are.
Elenco: Eline Powell , Alex Roe , Fola Evans-Akingbola , Ian Verdun , Rena Owen , Sibongile Mlambo .