Kat Planet is referenced in the TV guide summary for The Kat Went Back Part 2:
- "Coop and his friends are captured and taken to Kat Planet".
After Fiona calls it an ecological disaster, Dr. K affirms this, and adds that it is their 5th planet in 10 years, so each lasts an average of 2 years.
The term Kat Planet likely refers to any of the series of planets which the invasive species has colonized. The planet of origin and its name is unknown.
This one is pink and has a ring around it.
The Kats may terraform planets they take over to resemble themselves, based on the ears.