A few issues out of the way first: pacing is still a bit rushed, especially the introduction of Medusa, depiction of the gods' apathetic and sometimes immoral nature could be made subtler. Other than that, I loved this episode! Full of all sorts of fun easter eggs that die-hard fans can salivate over while also just being a well-written piece of media. Aryan as Grover got a lot better for me, mainly because he got more screentime centering on his character. They definitely highlighted Annabeth's fatal flaw of hubris more while also still making her a character we can attach too. Walker was obviously great as Percy and definitely sold the character for anyone who still has doubts about his ability to portray Seaweed Brain (though at this point, that's way less than 1% of the PJO fanbase). I'll leave it at that to not spoil the episode itself, but even a non-fan is probably going to get a blast out of it.