The Nimbus Cloud of Roshi (S01E03)

In a gesture of gratitude, the Turtle Hermit gifts Goku Kinto'un, a mystical flying cloud that can only be used by those with a pure heart. He also gives Bulma an orange trinket he had around his neck, a seemingly insignificant stone found on the beach. However, this "trinket" is actually a Dragon Ball. Unbeknownst to them, Pilaf and his minions, Mai and Shu, are on the hunt for this very Dragon Ball as well—and now they are aware that Bulma possesses it.