The third film sees Johnny English facing off against a cyber-terrorist, Valentine (Matilda Lutz), who has stolen a powerful artificial intelligence system.
If you're interested in watching the films, I recommend starting with the first movie, Johnny English (2003), and then proceeding to the sequels, Reborn (2011) and Strikes Again (2018).
In the second installment, Johnny English is brought out of retirement to stop a Russian villain, Timur Bekmambetov (Daniel Kaluuya), from detonating a nuclear bomb at the Olympic Games in London.