Does that chick on the new round of Taco Bell commercials look familar? There was a little old show on Nickelodeon called "The Secret World of Alex Mack" about a teenage girl getting covered with a chemical and gaining the ability to melt into a liquid. (Yeah I know) Meredith Bishop, played her sister, she is now twenty-nine years old and is now starring in these commercials! I guess the show reruns on the N now. Well Jessica Alba was on that show too.