Cells at Work!! The Return of the Strongest Enemy. A Huge Uproar in the Body’s Bowels! Arc Review

Having seen the first two seasons. I'd say this movie isn't exactly mandatory. Most of what happens plot wise was already in season 2 anyway. Still, it introduces some cool new characters and is just a highly enjoyable addition to the series. If you already love the series, you should absolutely watch it. It didn't let me down and I had a great time seeing the old crew interact with the new characters.