Baby's first Borg I guess? A pretty shallow episode overall.
There's essentially two sections here - crisis of the week and arcwork. The entire first act is more or less serving the needs of the arc as a whole, with us first checking in with the kids, then with the real Janeway. Then of course we come back to real Janeway again at the end of the episode for a final scene. All of the arcwork is...fine. The real issue here is the characters are learning things that we as viewers already know, which means there's zero drama. They can gussy it up a bit with character dynamics, letting us see the responses each one has to the revelations, but it's nothing which is surprising to us at all.
That leaves less than 15 minutes for the actual plot of the week, which is basically the kids stumble over the Borg. That's pretty much it. They somehow find a cube floating in random space (what are the chances of that?), explore it looking for a way to defuse the MacGuffin, and then realize the Borg are going to be no help at all. There's no overall forward movement here - they're right back to where they were at the start of the episode, save for knowing there's no way to actually deactivate the device.
I will give the episode some credit though. First, unlike last week, they remember that having a character arc is important, and Zero gets a bit of focus here. They start the episode feeling isolated and guilt ridden regarding the damage they did, go through the trials of being temporarily assimilated, and realize the "Magic of Friendship" is powerful enough to turn back. It's all extremely cursory because of the short runtime, but it's there. Also, I think they did a good job finding a way to make the Borg creepy yet still child-appropriate - and I'm happy in animation we finally get to see non-humanoid Borg.
Still, this may be one of the most forgettable episodes of Prodigy yet. It's basically just there to introduce the crew to the Borg. I guess it would hit different for children, but as adults versed in Trek, there's very little (other than Zero's arc) worth holding onto here.