Medford youth theater company Spotlight Productions presents the third of four performances of “Finding Nemo Jr.,” a 60-minute musical adaptation of the beloved 2003 Pixar movie “Finding Nemo.” Featuring memorable songs such as “Just Keep Swimming,” “Fish Are Friends Not Food,” and “Go With the Flow,” “Finding Nemo Jr.” brings a vibrant underwater world to life on stage in a story full of family, friendship, and adventure. Tickets are $20 through Eventbrite. The final performance will be at 7:15 p.m. on Saturday, April 27.