Actor Scott Baio is among the “celebs” to speak at the RNC. (Amy Sussman/Invision/AP)

Presumptive Republican presidential nominee Donald Trump, true to form, promised big things for the lineup of convention speakers at this week’s convention.

There would be sports figures (“winners,” as he called them). It would be a “showbiz” spectacle. Big names — boxer Mike Tyson, New England Patriots quarterback Tom Brady — were floated.

But in the end, the celebrities studding the roster of those taking Republican National Convention stage in Cleveland aren’t exactly household names.

The biggest “get,” added to the lineup on Sunday, might be Scott Baio, the actor whose biggest roles — in “Charles in Charge,” “Joanie Loves Chachi” and “Happy Days,” are a good quarter-century behind him. Baio has a prime-time slot at the RNC on Monday night, where he’ll somehow riff on the night’s topic,” Make America Safe Again.”

And there are not one but two soap-opera stars. Antonio Sabato Jr., who previously endorsed Trump, appeared in the early 1990s on “General Hospital” and more recently on “The Bold and the Beautiful.” Another “B&B” star, Kimberlin Brown, might be the most out-of-left-field pick. It does not appear that the actress, who played the soap’s baby-switching, murdering villainess for 16 years until 2006, previously publicly expressed support for Trump — or any candidate. (She’s an avocado farmer these days, according to the convention folks).

GOP standby celeb Willie Robertson, of “Duck Dynasty” fame, is also among the speakers. And as for sports figures, pro golfer Natalie Gulbis is the lone athlete on the program.