Action and comedy come to the fore this week as 'Iron Man 2' and 'Get Him to the Greek' arrive on DVD and Blu-ray. 'Iron Man 2' is, of course, the sequel that all Marvel fans have been waiting for; it's pumped with action sequences and a story line that actually advances the main character's motivations and development. 'Greek' is a comic take on the music business, with a young record company exec forced to babysit a raunchy rock store on his way to make a comeback concert appearance. Let's not forget 'Babies,' a pleasing documentary look at one year in the life of four babies from around the world. And, to round out the week's releases, there's a Blu-ray edition of the granddaddy of all monster movies, 'King Kong.'