Vikings fans probably shouldn’t expect to see any big cameos from franchise stars, though, since Valhalla will be set a full century after the flagship series’ events.
The drama is currently in production and working with COVID-19 safety precautions to try and avoid further delays.
That said, those characters’ legacies will be living on, so perhaps cameos won’t be impossible.
It’s possible-to-likely that Michael Hirst is limiting himself to an executive producer role on The Plague Year because he’s also working on the Vikings spinoff Valhalla that is heading to Netflix’s streaming library in the future.