Guard Llama, Flag, Validated, Guardian Bikes

To show how their smartphone app can improve personal security, two entrepreneurs from Chicago, Illinois, bring a live guard llama into the Tank; two entrepreneurs from Irvine, California, deliver a safer take on the bicycle by innovating the brake system; a trio from Seattle, Washington, have an app that helps shoppers and diners earn free parking in exchange for their business; and business partners from Santa Clarita, California, hope to convince the Sharks to take a shot with their free photo-printing service. Also, a follow-up with former professional football player Al "Bubba" Baker from Avon, Ohio, and his de-boned rib steaks known as Bubba's Boneless Ribs, which Daymond John invested in during season 5.