According to reports, there are not one but two HBO Max TV series in the early stages of development.

Robert Downey Dr. is heading up two 'Sherlock Holmes' TV series for the streaming service, attached to both projects as executive producer.

The series are both believed to be in their early stages of development, with Downey's production company Team Downey producing. The star is currently attached as a producer, but could he also reprise his role from both blockbuster films? Hopefully, we'll get word on that soon.

A third 'Sherlock Holmes' film starring Downey Jr was also in the pipeline at one time, but it failed to move past the development stage.

The beloved detective stories by Sir Arthur Conan Doyle have seen numerous adaptations in recent memory, with both of Downey's 2009 and 2011 cinematic efforts co-starring Jude Law and Rachel McAdams being successful money-makers at the box office under the directorial eye of Guy Richie.

Less successful, however, was Will Ferrell and John C. Reilly's comedic effort 'Holmes & Watson' from 2018. This clanger has a 10% Rotten Tomatoes score.

In terms of 'Sherlock Holmes' TV series adaptations, Benedict Cumberbatch's 'Sherlock' for the BBC remains a firm fan favourite. The first three seasons received high praise, but the series fell short during its final three episodes of season four, failing to live up to expectations.

Since departing the Marvel franchise as Iron Man, Robert Downey Jr has stepped into roles behind the camera instead of in front of them. He produced Netflix's 'Sweet Tooth' from 2021, and also executive produced and starred in the critically-panned 'Dolittle' reboot for Universal Pictures. The Team Downey production company fared much better with their 'Perry Mason' TV series for HBO, which has a second season on the way.