Author: Kelly Lawler and Bill Keveney, USA TODAY

As “The Goldbergs” and “The Fosters” get spinoffs, we look at the very best (“The Colbert Report”) and the very worst (“Joey”) offshoots of all time.

Luke Perry, best known as brooding Dylan McKay on ’90s teen hit “Beverly Hills, 90210,” died Monday. But his legacy far outlasted his biggest decade.