Whilst the first season takes some material from the first book "Stormbreaker" and some new additional material added for the show, its overall arc is based on the 2nd novel in the Alex Rider series, "Point Blanc"
This first season is based on the book Point Blanc which is the second book in the series. Originally Anthony Horowitz had decided to do the Point Blanc story as the first book but changed his mind to Stormbreaker.
Alex Rider TV confirmed on 19th January 2023, via their social media channels, that Alex Rider Season 3 was in production. It had already been spotted filming since late November 2022 in Bristol and Anthony Horowitz (writer of the original Alex Rider books) confirmed they were approximately halfway through filming the third season. It was also confirmed that the third season would be based on the fifth book, 'Scorpia'.
Vicky McClure (Mrs Jones) and Ace Bhatti (Crawley) worked together on Line of Duty (2012) as DI Kate Fleming and PCC Rohan Sindwhani respectively.
Both Stephen Dillane and Brenock O'Connor played in Game of Thrones (2011) as Stannis Baratheon and Olly.