Today, I ascertained that Lost TV show series is the most popular at this time. So, although Lost season 6 episode 5 will be aired on February 23, 2010 (Tuesday at 9/8c) on ABC. I've decided to write now. ABC listed this upcoming episode with title as "Lighthouse." To ensure you will not miss this upcoming episode, starting from now, prepare your time. You need to remember, Lost season 6 is the finale series and you can't watch again to season 7.