 The Adelphi Plaza contains a MegaMart Supermarket, Sabor Latino restaurant, La Casa De La Musica, McDonald's, King Kong Chinese Restaurant, and a Shell gas station.The MegaMart Supermarket in Adelphi, MD was formerly named as, "Panam Supermarket", as the MegaMart chain in the D.C. area used to be called,"Panam Supermarket", until 2009.From that year onwards.