Safari Al is perhaps the most obscure of Calvin's alter egos. Safari Al appeared on April 2, 1986 in a one-joke strip involving Calvin's room resembling a jungle. In it, Calvin himself took on the Safari Al persona, while his mom took on the persona of a large, King Kong-like simian.
Interestingly, the hat Calvin wears as Safari Al resembles the hat he donned in the first strip, making it possible that Safari Al appeared before Calvin truely did. The strip's plot--trapping a tiger--certainly fits within the characters of a jungle adventurer.