The battle with the Furies on the bus (and the bus exploding) is not shown, but it is mentioned once. The demigods rush to the rescue to find that Grover has made an important discovery: two powerful half-bloods whose parentage is unknown. But that’s not all that awaits them. The titan lord Kronos has devised his most treacherous plot yet, and the young heroes have just fallen prey. Medusa is not on the printed version of the graphic novel. The scene with her can only be found online.

Featuring a faithful adaptation by Robert Venditti, stunning artwork by Attila Futaki, and sumptuous colours by newcomer Tamas Gaspar.Percy didn't fight Luke in the end. However, Chiron explained that he ran away without telling anyone. The plot in the graphic novel and book is generally the same. Some parts were cut out and some were not told in details as they were on the book:

With a true storyteller’s sense of pacing, Riordan creates another compelling adventure, right down to the cliff-hanger at the end.”– Booklist In The Son of Neptune, Percy, Hazel, and Frank met in Camp Jupiter, the Roman equivalent of Camp Half-Blood, and traveled to the land beyond the gods to complete a dangerous quest. The third book in the Heroes of Olympus series will unite them with Jason, Piper, and Leo. But they number only six–who will complete the Prophecy of Seven? It's not easy being a half-blood these days. Even a simple game of dodgeball becomes a death match against an ugly gang of cannibal giants - and that was only the beginning.