Topher Grace is joining the cast of Sony’s “Spider-Man 3” alongside returning cast Tobey Maguire, Kirsten Dunst and James Franco. Thomas Haden Church also makes his Spidey debut. The movie will be released May 4, 2007, with production beginning early next year. Grace and Haden Church will both star as Spidey nemeses, though their exact characters are being kept under tight wraps, causing much Internet speculation as to what villains director Sam Raimi will be pulling out of the Marvel closet this time. This will be the first “Spider-Man” film in which the webslinger will face not one but two enemies.