LOS ANGELES, June 18 (UPI) -- 28 Years Later , in theaters Friday, takes many creative risks with the horror franchise. Just enough of those risks pay off to make the film worthwhile, though several threaten to derail the whole movie. The sequel opens 28 years after the rage virus infected Britain in 2002's 28 Days Later. The region was quarantined by the rest of the world in the 2007 follow-up 28 Weeks Later , which ended with the virus spreading to mainland Europe. 28 Years Later introduces