Planet Meow stars Kristal as Miu Miu, a cat-like alien from a distant, technologically-advanced planet. She looks after her beloved human master Sze Sze (child star Celine Yeung) from above. After watching Sze Sze suffer from her parents’ deteriorating relationship, Miu Miu decides to visit earth again to help her master, this time in human form.
Miu Miu, as a human, encounters the bone-setting master Ko Kwai (Mimi Chu), who hires her. By chance, she ends up working for Sze Sze’s father, Garfield (Moses Chan) at his research company. Miu Miu is protective of Garfield, and is aware that his superiors, Hill (Eddie Kwan) and Natasha (Vivien Yeo), have been plotting against him. Though Miu Miu works hard to fix Garfield’s relationship with his wife Cat (Nancy Wu), Miu Miu can’t help but to fall in love with him.