Sarah's rotten cat Ralph goes to a Halloween costume party dressed as her and creates horrible mischief under the protection of his disguise.

When he goes to a carnival with Sarah and his cousin Percy, Rotten Ralph learns that winning is not everything.

Afraid of being left alone, Rotten Ralph, the nasty red cat, follows Sarah to school and tries to prevent her from making new friends.

When the veterinarian determines that Sarah's cat has used up eight of his nine lives, will the high-spirited feline finally stop misbehaving?

Sarah's cat Rotten Ralph tries to help her create a school project based on ancient Egypt, but he is more of a hindrance than a help.

Rotten Ralph comes to appreciate Sarah's healthy cat food after he gets sick from eating out of trash cans.

Sarah's high-spirited, poorly behaved cat, Ralph, disrupts her aunt's wedding with his outlandish antics.

When Ralph's friend Sarah explains Santa Claus' special list of who has been naughty and nice, Ralph is determined to make the perfect impression by stealing his neighbor's Christmas lights, decorating everything with red paint, and taking the angel's halo for himself.