The Last Starfighter

The Last Starfighter is a 1984 American space opera film directed by Nick Castle. The film tells the story of Alex Rogan (Lance Guest), a teenager who, after winning the high score in an arcade game that's secretly a simulation test, is recruited by an alien defense force to fight in an interstellar war. It also features Dan O'Herlihy, Catherine Mary Stewart, and Robert Preston in his final role in a theatrical film. The character of Centauri, a "lovable con-man", was written with him in mind and was a nod to his most famous role as Professor Harold Hill in The Music Man (1962)…Wikipedia