Series
| Series Name | Release Date | Product Count |
|---|---|---|
| Ocean Animals | 2020-08-01 | 16 |
| Ocean Life | 2025-01-01 | 9 |
| Ocean Life Up Close | 2018-01-01 | 30 |
| Oceans Alive | 2009-08-01 | 40 |
| Off to Space! | 2021-01-01 | 5 |
| Once Upon a STEM: The Science of Fairy Tales | 2020-08-01 | 6 |
| On the Hunt | 2025-01-01 | 7 |
| Oops! Accidental Inventions | 2023-01-01 | 7 |
| Opposites | 2017-08-01 | 8 |
| Origami Fun | 2017-08-01 | 15 |
| Our Favorite Brands | 2019-08-01 | 13 |
| Our Favorite Foods | 2020-01-01 | 11 |
| Our Favorite Video Games | 2024-08-01 | 7 |
| Our Government | 2020-08-01 | 8 |
| Our Greatest Adventures | 2023-08-01 | 5 |
| Our Planet Earth | 2021-08-01 | 14 |
| Our Solar System | 2023-01-01 | 11 |
| Outback Babies | 2021-08-01 | 8 |
| Outdoor Adventures | 2014-01-01 | 17 |
| Outdoor Explorer | 2018-01-01 | 10 |
| Out of this World | 2015-01-01 | 13 |
| Paranormal Life Cycles | 2024-08-01 | 5 |
| Paranormal Mysteries | 2019-07-01 | 8 |
| Party Time! | 2023-08-01 | 7 |