SEASON FINALE: All season long, South Park has presented a continuing story line, which managed to comment on the nation’s presidential election while also laying the groundwork for a brilliant satirical concept: the idea of a threat, from a foreign country targeting and hacking the U.S., to reveal the complete Internet histories of individual citizens. It’s the email hacking threats writ very large, with the idea that if people’s private computer searches and other anonymous activities were made public, there would be much less computerized snark and bullying. Even the title of tonight’s episode, which concludes this season-long story line, is quietly brilliant: It’s “The End of Serialization As We Know It.”