Jack is a St. Bernard dog encountered by penguins Lolo and Pepe after their capture by poachers and separation from their colony. He communicates with them and aids their escape from the poachers' ship. Jack demonstrates an ability to howl in a manner that coincides with or triggers severe storms, which he uses strategically to distract the poachers during the escape. He provides a lifesaver to Lolo and Pepe, enabling them to float safely from the poachers' vessel on an iceberg. This action facilitates their eventual return to their colony. Jack's interactions occur solely within the context of aiding the penguins' escape.