Best Bets on TV tonight

“The Simpsons 20th Anniversary Special: In 3-D! On Ice!” (8:30 p.m., Fox): In “The Simpsons 20th Anniversary Special,” documentary filmmaker Morgan Spurlock has just one hour to sum up the incredible legacy of one of television’s most popular and revered shows.

“Chuck” (9 p.m., NBC): “Chuck” is back in a two-hour season opener that has our hero (Zachary Levi), with his remarkable new skills, attending spy school. Unfortunately, he flunks out.

“Big Love” (9 p.m., HBO): Season 4 of the polygamous drama “Big Love” launches tonight and Bill (Bill Paxton) wants to run for political office.