Joel is a person that ALF hires to sell the gold from his spaceship. He also finalizes the deal for ALF's Ferarri purchase. Joel is vacationing in Palm Springs after the Ferarri purchase and later in Paraguay, after the mango farm investment that he engineers falls through when the farm gets swallowed by a fault line (according to Joel).
Joel's letter

Joel's letter to ALF regarding the investment of the proceeds from his gold.

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