When Spike and his friends go on a trip to Daypony Beach, he's rescued from the sea by a strange filly. Despite having reservations about this mute pony, Spike and his friends welcome her into their group. However, the restless ocean--as well as the innkeepers warnings about the mysterious "ponies of the sea"--has everypony nervous, and when a nearby clan of dragons becomes involved, things go from bad to worse.
Stories in the Ponies of Olympus continuity (chronological):
Rolling In Beaches
Ditzy wants to change her clumsy ways and turns to Twilight for help.
On a summer trip to the beach, Spike meets two interesting females, and Rarity is none too happy.
Spike is tired of being worked like a dog, but what will he do when he's made a bird in the Diamond Dogs' gilded cage? Despite being treated well, he may end up having to beard the lion in its den when dark dealings are revealed.
Rarity's looking for her very special somepony, and as the Princess of Love, Cadance is happy to help.
Rarity is visited by her master and Scootaloo enters a fighting tournament.