Migrator

The Migrator is a ship owned by Rockhopper. It has been hijacked on two occasions by Chill and his friends.

(Not So) Elite Penguin Force
During (Not So) Elite Penguin Force, the Migrator is arriving at Club Penguin, when suddenly it gets wiped out by the Void, along with Rockhopper, Yarr, and Kirby. A while later, The Party boards what's left of the Migrator and finds a wig being given out in Rockhopper's Rare Items. After the defeat of Uberfuzzy and his minions, they find a heart in the sand and it restores the Migrator along with its passengers. Later, Mario decides to hijack it and they sail to Rockhopper Island. Eventually they return and put it back in place before Rockhopper figures out they stole it.

The Mega Snowball Fight
In The Mega Snowball Fight, Mario gets bored and wants to hijack the Migrator again. While sailing, a storm tosses them onto the Unknown Island where they find Johnny who got stranded there. Afterwards, they sail back to Club Penguin.

Strangely, despite the Migrator already being docked at the Beach by The Party, a plot hole causes Rockhopper and Yarr to appear a few chapters later and dock the Migrator.