When does National Geographic Explorer return?

National Geographic Explorer is the longest-running documentary television series on cable television. The original series was three hours in length, containing five to ten short films. In its 36 years on television, Explorer has worked for five television outlets. In 2010, the show celebrated its 25 year anniversary with a special, "Explorer: 25 Years" The original Explorer series ended in 2011 and then was started again in 2015.