Robin Williams plays Rainbow Randolph, the colorful star of a popular children’s television show, who is fired over a bribery scandal and replaced by a Barney-esque rhinoceros named Smoochy (Ed Norton). When Randolph discovers that Smoochy is having an affair with his ex-lover, Nora (Catherine Keener), a top programming executive at the network, he plots his revenge. The film also stars Danny DeVito as Smoochy’s agent and Jon Stewart as the network president…