Having run out of ideas and realizing anniversaries would not fit in with Tarzan's uncivilized lifestyle, Jane returns to the treehouse in disappointment, only to cheer up after finding it decorated and everyone, including Tarzan, who is wearing his father's suit, had planned a surprise party to make her happy. Terk, Tantor, and the Professor had known about it all along and were simply distracting her while everyone else got the party set up. Tarzan gives Jane a diamond ring made from the same diamonds in the volcano.