If you can’t quite remember every line of the “Schoolhouse Rock!” educational songs from half a century ago, you’re covered, as the lyrics will be captioned in the special ”Schoolhouse Rock! 50th Anniversary Singalong” (ABC, 8 p.m.), where Jason Biggs and Jenny Mollen will handle “I’m Just a Bill,” pictured above.

Also on the show: Black Eyed Peas doing “Three is a Magic Number,” Julianne Hough singing “Interplanet Janet,” Ne-Yo crooning “Verb: That’s What’s Happening” and Raven Simone teaming with Kaleidoscope Penn on “Interjections.” Ryan Seacrest again hosts this fifth installation in ABC’s “Singalong” series. 

The new space series “The Ark” (SyFy, 10 p.m.) concerns a young crew seeking to colonize another planet a century in the future who suddenly find themselves in a crisis (rather like HBO’s “Avenue 5”). Creator Dean Devlin devises a monochromatic world of grays; the cast isn’t much more colorful. 

The story of a German shepherd who was supposedly left $400 million when its wealthy owner diesis the basis for a new series “Gunther’s Millions” (Netflix, streaming). 

Last year’s “Black Panther: Wakanda Forever” (Disney+, streaming) makes its premium cable debut.

Entertainers of color and civil rights struggles in Sin City are the topics on the special “Soul of a Nation: Black in Vegas” (ABC, 10 p.m.) which includes interviews with Smokey Robinson, Usher, Ne-Yo and an archival one from Sammy Davis Jr.