NEW YORK — In theater, you want comedy, you want tragedy, you want pathos, and you want a plucky protagonist. All the more reason to put Marc Summers’ life story on stage. Which also means slime is involved. “The Life & Slimes of Marc Summers,” which premiered last week off-Broadway at New World Stages, is part game show and part memoir, as it tracks the career and life of Summers, whose Wikipedia entry reads like a who’s who of TV over the last four decades. There’s even audience participation. Summers is best known for hosting the famously messy Nickelodeon kiddie game show “Double Dare” and…