Second First Day is the premiere episode of Season 2 of the Netflix show Alexa & Katie.
- Paris Berelc as Alexa Mendoza
- Isabel May as Katie Cooper
- Tiffani Thiessen as Lori Mendoza
- Emery Kelly as Lucas Mendoza
- Eddie Shin as Dave Mendoza
- Jolie Jenkins as Jennifer Cooper
- Finn Carr as Jack Cooper
- Jack Griffo as Dylan
- Kerri Medders as Gwenny Thompson
- Merit Leighton as Hannah
- Iman Benson as Reagan
- Nathaniel J. Potvin as Ryan
- Jordan Austin Smith as Cody
- Gregg Daniel as Dr. Breitweiser
- During Alexa's recap of her seconds half of freshman year, the spring musical was understood to be The Sound of Music. However, in The Play, Part 1, Alexa and Katie state that their school did The Sound of Music the previous year, and it is highly unlikely that they would do the same musical two years in a row.