Mr. Burtonburger had to go to another town to get something for the House of Swap, so he left the kids with a teenaged babysitter, Tina, who lived three doors down. Kat tried to make various weapons to kill Coop, like a tiny flying heat-seeking saucer that shot lasers, and tried all day to kill Coop. Tina kept secretly and accidentally witnessing Kat trying to kill Coop while she was looking after Millie, and reacted the same way Coop's teacher did, with her eyes twitching and shaking her head in shocked disbelief.
Eventually, she ended up foiling Kat's plan to crush Coop with a boulder after he had tied him to his bed, by splashing Kat with a bucket of water and untying Coop just in time. Coop said happily,
" Thanks! You're awesome! I can't wait until next time you babysit! " She said, " Next time? Oh, no, there's not going to be a next time! The next time could be my last! " and quickly ducked out of the way when Kat tried to attack her. Burt rang the doorbell, and she took the money and ran away from the house in fear, vowing to never babysit them again. Coop commented, " Too bad... She was a great babysitter. " Millie commented, " She sure was, " and went to bed with a smile, holding an annoyed Kat.
