Star Trek. The final frontier. These are the podcasts of three enthusiastic nerds. In Star Trek: The Original Series “Shore Leave,” the Enterprise crew beams down for some much-needed R&R and ends up dodging their own daydreams. Sulu’s obsession with antique weapons resurfaces, and Jim, A.Ron, and Talitha debate two key questions: how many Talithas does it take to beat a tiger, and who in their right mind would want fantasies this dangerous?