Launching a new daytime talker isn’t as easy as it sounds. Here are five stars who found that out the hard way.

“The David Letterman Show” (1980): The NBC executive who thought Johnny Carson’s protégé would work in the morning is most likely related to the person who greenlighted Jay Leno’s move to prime-time.

“Marilu” (1994-95): Because of her superior memory, former “Taxi” star Marilu Henner can probably remember every single episode of this short-lived series. She’s the only one.

“The Tempestt Bledsoe Show” (1995-96): The former “Cosby” kid desperately wanted to be the next Oprah Winfrey. One problem: The Big O was still in her prime in the mid-’90s and no upstart was going to knock her from her perch.

“Gabrielle” (1995-96): “Beverly Hills 90210” star Gabrielle Carteris tried to reinvent herself with this hot mess. She can now be found waiting tables at the Peach Pit.

“The Howie Mandel Show” (1998-99): The “America’s Got Talent” judge was still shaking hands and sporting a full head of hair when audiences said “no deal” to this amateurish effort.