The Helmachronians are back! For reasons they've camped out in Marco's body and the Animorphs shrunkify themselves to root them out. This is a 'Fantastic Voyage' episode that's not terrible in and of itself. It's just incredibly unnecessary.
The viewpoint shifts to Marco so readers know what's going on outside of his body and there's a McGuffin about a disposable camera and some laughed-off rabies. I...don't have anything else to say about this.
Next: 'The Test'
Previous: 'The Familiar'