Cassandra the Cruelest Kitten is the antithesis of Apollo the Super-Pup. She wrecks things and make others upset while Apollo the Super-Pup comes to save anybody in danger.
Cassandra was shown to be extremely cruel and violent. Being a dangerous enemy towards Apollo the Super-Pup, she hated him.
Cassandra, as shown in the TV show, takes the appearance of a typical Siamese cat. She has cream fur, with darker lavender extremities and slanted light-blue eyes. The kitten also has a magenta collar with a 'K' attached at the center and three small, light-blue dots (presumably fake jewels or sequins).