Medford youth theater company Spotlight Productions presents the third of four performances of "The SpongeBob Musical" at Medford High School's Marsha Caron Theatre. Dive into the underwater world of Bikini Bottom with all your favorite characters, catchy songs, and hilarious adventures. Today's show features the "Super Sea Star" cast. The "(Not) A Simple Sponge" cast will close the production with a performance at 7:30 p.m. on Saturday, September 14. Tickets are $20 for adults and $15 for students. Purchase tickets…