ABC's potential black-ish spin-off has found its leads.

Tika Sumpter and Anders Holm have been cast to star as the parents of Rainbow (played in black-ish by Tracee Ellis Ross) in a flashback episode of the ABC sitcom. The episode is expected to serve as a test run for a potential prequel spin-off series centered on Bow's younger days, according toThe Hollywood Reporter.

The two will be joined in the backdoor pilot by Arica Himmel as teen Rainbow. The cast is filled out by Ethan William Childress, Mykal-Michelle Harris, Gary Cole, and Christina Anthony.

Deadline first reported in February that ABC was considering a prequel series centered on young Rainbow.

The flashback episode is expected to be set in the '80s or '90s during Rainbow's teen years, and black-ish's own co-executive producer Peter Saji is in talks to write the script. It is expected to film this month.

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The potential prequel series would the second black-ish spin-off, following grown-ish's debut on Freeform in early 2018. black-ish showrunner Kenya Barris would remain an executive producer on the hypothetical prequel, despite his recent deal with Netflix, although he may not be as involved in the spin-off as he has been in the original series.

grown-ish was born of its own backdoor pilot back in black-ish's third season, which featured Zoey Johnson (Yara Shahidi) heading off to college at the fictional Cal U. The Zoey-centric series was renewed for a third season at Freeform in early February.

black-ish airs on ABC on Tuesdays at 9/8c.

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