: Zac and Mimmi are finally reunited with their mother, Nerissa, who explains she had been in a deep sleep until her children's bond woke her.
The plot reaches its peak when the group discovers that the Water Dragon is actually Nerissa herself, cursed long ago. Through a combination of Eastern magic and the siblings' maternal bond, they are able to break the spell, restoring Nerissa to her mermaid form and reuniting the family. Notable Themes and Resolutions mako mermaids season 4eps16 top