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.
After getting struck by lightning during the The Great Vampire War, Ying Wuet Tseuk and his gang of thieves become The Undead, a race of immortal beings. For the next 500 years, Ying Wuet Tseuk kept his identity hidden and secludes himself in the city, spending sleepless nights managing a late-night food hall. Skilled in martial arts, Ying Wuet Tseuk also operates a martial arts training hall and accepts two disciples under his wing. Ying Wuet Tseuk is in love with forensic scientist Lam Mung Nam, a vampire who had her memories and powers completely sealed away. Unaware of her vampiric identity, her only remaining power is the ability to revive the dead for one minute. For years, Ying Wuet Tseuk stayed by her side silently, helping her piece memories back together one by one.
Keung Yung has had a crush on her co-worker Michael Chiu Wai Kan for over ten years, but she is too afraid to confess her feelings. One night while talking on the phone with her other co-worker Shun Suk Mui, Yung is electrocuted to death because of her bootlegged phone. Regretful of not being able to fulfill her romantic wishes in life, she uses Suk Mui, who is the only person that can see her due to their final phone conversation, to pursue Michael.