Captain America Casting News It could happen as Marvel conducts screen tests this week in its search for the actor to play Steve Rogers, the alter ego of the title character in its "Captain America" movie. The company's latest superhero movie is being directed by Joe Johnston and tells the story of the young infirm man rejected from enlisting who becomes America's symbol of liberty during World War II and eventually a member of Marvel's superhero team the Avengers. About seven actors have moved to the front of the super soldier serum testing line and have either tested or are expected to screen test this week and next at Marvel's Manhattan Beach headquarters. Those known to be on the list with John Krasinski include Michael Cassidy (who appeared in"Smallvile" and who tested for the Superman movie when McG was going to direct it), Patrick Flueger (one of the stars of "The 4400" who most recently appeared in the Tobey Maguire movie "Brot