User blog comment:Darkcloud1111/Official "The Sea of Monsters (movie)" Discussion/@comment-1515612-20130703154151/@comment-3146930-20130713154634

In the first movie anyway, he never really brings up Pan or the search. Because of this missed plot point, they need to get him to Polyphemus' island somehow. Grover will most likely travel with them, then get kidnapped by Polyphemus before Percy, Annabeth, and Tyson enter the Sea of Monsters (as Grover is not scene in the trailer during this part).