Jack, the round-headed fictional chief executive in Jack-in-the-Box commercials, is not only a hit on television. He's also popular on Wall Street. In the last year, investors have driven the company's stock price up more than 80% - and industry analysts are bullish about the company's future. Jack in the Box Inc.'s profit was up sharply in its recently completed fiscal first quarter, as sales increased at its flagship restaurants and at the company's other brand, Qdoba Mexican Grill.