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 Kats may terraform planets they take over to resemble themselves.