TV This Week, April 29-May 5: 'The Simpsons,' 'AMC Visionaries' and more

SUNDAY

“The Simpsons” hits the 636-episode mark, besting “Gunsmoke” as the scripted series with the most episodes in TV history … the difference being, “Gunsmoke” was still funny after its 10th season. 8 p.m. Fox

The kids aren’t all right in the new made-for-cable thriller “Nanny Killer.” With...