It is set to premiere sometime midseason in 2021. 
- A reveal on what May was talking about to Maddie at the end of "What's Next?" regarding her college choice.
- The storyline of Maddie and Chimney's relationship continuing, and the steps they go through during her pregnancy. 
- More of Bobby's backstory, and the growth of his and Athena's relationship.
- A "new phase" for Buck, on moving on from Abby after the events of "What's Next?".
- A potential crossover with its spinoff series. 
- Angela Bassett as Athena Grant
- Peter Krause as Robert Nash
- Jennifer Love Hewitt as Maddie Buckley
- Oliver Stark as Evan Buckley
- Aisha Hinds as Henrietta Wilson
- Kenneth Choi as Howard Han
- Ryan Guzman as Edmundo Diaz
- Rockmond Dunbar as Michael Grant
- Corinne Massiah as May Grant
- Marcanthonee Jon Reis as Harry Grant
- Gavin McHugh as Christopher Diaz
- John Harlan Kim as Albert Han
- Writing for this season has already begun, according to Tim Minear. 
- On May 23, 2020, Tim Minear confirmed that a Buck Begins episode was being planned for Season Four. This episode will be focused around Evan Buckley's backstory. 
- Robert Nash's brother will have a key role in Season Four.
- On August 27, 2020, it was announced that John Harlan Kim would become a series regular in Season Four. 
Community content is available under CC-BY-SA unless otherwise noted.