Rogen and Evan Goldberg... penned the outline that allows the stars to riff and improvise, as per their established formula. Improvisation in comedy is never easy, and for these dudes, the formula really works. They have terrific chemistry, and it never looks like they're having more fun than the audience. Unfortunately, the loose structure lazily rushes out plot points late in the game. This Is the End is about friendship under the test of dire circumstances, but the resolution is underwritten.