Marina was the former love interest of Chad Lee from Power Rangers Lightspeed Rescue.
She was a mermaid princess and the daughter of King Neptune who has been left for dead by an unknown Evil, until Vypra rescued her and captured Chad.
She begins to love Chad.
When one of Bansheera's monsters stole her father's trident, Marina asks Chad and his friends for help in getting it back, or Neptune would lose his powers and disappear.
She was turned into a human so she could go on land, but she became weaker and eventually cease to exist herself the longer she was away from the ocean.
Chad was able to get her back to the ocean allowing her to live.
In the end, she asks her father to turn her back into human as she spends her final day with Chad.