The thing that slept over is the twenty-sixth episode in the first season of Lucky Fred.
Brains investigates a slumber party to find out who has the leech.
- First appearance of Slimetra.
- First main role for Simone and Slimetra
- Braianna is dressed as a normal girl and did not changed to any other clothing, during the whole episode.
- In this episode, it is revealed that the Super Commander has a disguise of his own.
- Braianna uses the capture vial for the second time, but only bigger than the previous vial in Episode 7.
- When Braianna takes her laboratory jar and holds it with one hand, and is seen bigger when she holds it with both of her hands.
- Braianna is the only person that wasn't affected from Fred's enhanced attractiveness.
- Fred is the only host that was able to resist Slimetra's control.
- This is the second time that Roberta made an appearance without Robert.