There are five planned seasons of the show, each adapting one book from the series.
One of Rick Riordan's chief complaints about Percy Jackson y el ladrón del rayo (2010) was the aging up of Percy and other characters to be in their late teens. As a result, when writing the pilot for this series, Riordan was particular in stating that Percy was 12 years old.
Toby Stephens plays the sea god Poseidon in the show. Stephens mother is Maggie Smith, who played the sea goddess Thetis in Furia de titanes (1981), an adaptation of the myth of Perseus.
Rick Riordan had planned to enter a semi-retirement and pursue his PhD when Disney approached him about this series. This series, in conjunction with the proposed Netflix adaptation of The Kane Chronicles, made him reconsider and ultimately delay his plans.
Rick Riordan was famously shut out of development of the film adaptations of his books. He has assured fans that he will be more involved this time around.