Peter Sam Cassidy is Kat's father and the owner of the organic shop. He is also the son of Kat's grandma.
Peter wears green pants, Red and Yellow Button up shirt and a Green Short-sleve shirt.
Peter has a Positive attitude.
- Peter appears to have two seperate color model sheets; sometimes his hair is brown, while in other cases he's a blonde. The "brunette" look often accompainied Kat's straight-haired design.
- In "Shark Shrunk", it is revealed that Peter's dad is a left-wing hippie. Kat believes Peter's "granola act" is to please him.