I watched this at home on BluRay from our public library.
The IMDb rating seems a bit low, this is a very well-made and entertaining movie, with A-list actors, even those who voice animated characters.
Queen Victoria is ill and dying, in talking to a squid in a tank suspects she is being poisoned. They set off on a long cruise to find a particular plant that no one knows for sure exists but could cure the Queen.
Lots of green screen and CGI are involved, as such it takes on the look of a cartoon more than a conventionally filmed movie. It reminded me of watching Saturday morning cartoons with a few live characters.
Overall very entertaining, I watched it again 3 months later (September 2020), then almost 4 years later (APR 2024), this time with my wife also, and enjoyed it even more the second and third times. Plus I am a big Jessie Buckley fan, she plays the sick Queen, ultimately a small part but she lights up the screen.
