Cosmic History is the 79th episode of Rosemary Hills that features a crossover with the characters from The Spacebots. It was released on August 8, 2011.
Milly and her friends travel to Spaceland and meet the Spacebots.
- Leo and Leah
- Sam Spacebot (debut)
- Simon Spacebot (debut)
- Seth Spacebot (debut)
- Soleil Spacebot (debut)
- Sarah Spacebot (debut)
- Sally Spacebot (debut)
- Corey Burton, Chris Young, Jen Tolley, Tress MacNeille, and Russi Taylor reprise their roles as Sam, Simon, Soleil, Sarah, and Sally. Lynette Gillis replaces Billie Mae Richards as Seth.
- This is another time Valora kisses Milly on the lips. Valora also kisses Soleil, Sarah, and Sally in this episode.