Trains, Submarines and Zeppelins: Part 1 (S04E01)

While searching for red platanoids at the Big Pond for the Winter Solstice Celebration, Mr. Pteranodon and Larry inadvertently miss the last train back. Now, they must set aside their disagreements and work together to find a way home. Will they manage to avoid being stranded in the wilderness and make it in time for the family celebration, or will their bickering keep them from returning?