Nightmare Fuel / Kid vs. Kat

• Mr. Cheeks: "We're everywhere!"
• Part 2 of the final episode, "The Kat Went Back" reveals that the Kats take over planets, ruin the environment, and simply move to another one to repeat the process. According to Dr. K, the current planet they're on is the fifth planet in ten years! When Fiona calls her species out on their selfishness and laziness, she brushes it off and justifies it by them being cats.
  Coop: Well, you better get used to this mess, because you're not moving to Earth.
• The ominous music that plays when Old Lady Munson appears on screen especially considering that she's an Cranky Neighbor and an Unstoppable Rage at the same time especially to Coop. The same sound plays during in the title cards of the episodes "Trespassers Will Be Persecuted", "Dial B For Babysitter", "Bringin' The Heat" and "The Three Aarghs".