​From Wikipedia, the free encyclopedia.   Jon Foster (born August 3, 1984) is an American actor. He is perhaps best known for his roles in the 2004 film The Door in the Floor, the 2006 horror movie, Stay Alive, and co-starring opposite Jenna Elfman in the CBS comedy Accidentally on Purpose. Description above from the Wikipedia article Jon Foster, licensed under CC-BY-SA, full list of contributors on Wikipedia.