The sequel to the 2005 film "Fantastic Four", "Fantastic Four: Rise of the Silver Surfer" tries to build on the original's foundation but falls short in many areas. The movie takes place a year after the events of the first film and sees Mr. Fantastic ( Ioan Gruffudd), Invisible Woman (Jessica Alba), Human Torch (Chris Evans), and The Thing (Michael Chiklis) facing a new threat in the form of the Silver Surfer (Doug Jones).
If you are looking for older films that functioned as a "second" movie: Fantastic Four: Rise of the Silver Surfer (2007)