According to IndieWire, Viggo Mortensen is slated to appear in the National Geographic series Cosmos:Possible Worlds next season as Soviet plant geneticist Nikolai Vavilov.
Viggo isn’t the only big name. Neil DeGrasse Tyson will host; Patrick Stewart is also on board as astronomer William Herschel, and Academy Award winning costume designer Ruth E. Carter will bring her magic. See the IndieWire article for more details.
This Cosmos sequel series will premiere March 9, 2020 on National Geographic, with a summer premiere on Fox. The new trailer for the series doesn’t mention specifics but is still a good watch:
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  National Geographic and Fox completed their investigation and cleared Tyson of the allegations by March 15, 2019, and affirmed that Cosmos would resume at some point.  The series premiered in early March 2020 in the United States on the National Geographic Channel and was scheduled to air on Fox afterwards, as well as in 172 other countries.