Clu is also the name of Kevin Flynn's search-and-retrieve program in the 1982 Disney movie Tron. Clu is played by the actor who plays Flynn, Jeff Bridges. Unfortunately, Clu does not last long; he is captured or killed by the MCP's enforcers early in the movie.
Clu has a small, floating, geometric solid as a companion, named Bit, who does manage to escape.