BY ADAM THOMLISON

Q: Is there any reason why John Goodman was never in “The Big Bang Theory”?

A: It seems there was no particular reason for it, but I see your point. Mega-hit 2000s sitcom “The Big Bang Theory” was pretty stacked with stars from mega-hit ‘90s sitcom “Roseanne,” including Johnny Galecki (Leonard on “BBT” and David on “Roseanne”), Laurie Metcalf (Sheldon’s mom, Mary, on “BBT” and Jackie on “Roseanne”) and Sara Gilbert (Leslie on “BBT” and Darlene on “Roseanne”). But the real glue that binds these shows together is Chuck Lorre. The “Big Bang Theory” creator wrote for “Roseanne” early in his incredible career.

But despite all of these links, John Goodman, one of the more popular stars on “Roseanne,” never made an appearance. The only reason for this seems to be because he was just too busy.

Roseanne Barr was, of course, the focal point of “Roseanne,” but in terms of general acting success, Goodman was always the biggest name on the show. And throughout his sitcom success, he has also maintained a parallel career as a critically acclaimed big-screen star.

That’s continued in recent years as well and has expanded to include a niche as a voice actor (in such smashes as the “Monsters, Inc.” and “Transformers” movies).

Q: Why does it seem like all ‘90s sitcoms went to Disney World (or Disneyland)? I remember “Full House,” “Family Matters,” “Roseanne” and others going there during their runs.

A: You’ve spotted a TV trend that AdWeek magazine called a “rite of passage” for sitcoms. And it’s not just restricted to the ‘90s — AdWeek’s quote was in reference to the modern sitcom “Black-ish” going to Disney World in 2016.

There are a couple of things all of these shows have had in common: they’re all family shows, and they all air on ABC.

And ABC, of course, is owned by Disney.

This trend seems to have begun with “Blossom” in 1993. That show aired on NBC, but it was produced by Disney-owned Touchstone Television.

But it’s not just about corporate synergy. As AVclub.com writer Myles McNutt pointed out in his history of “the Disney episode,” Disney didn’t yet own ABC when “Full House” went to Disney World in 1993. Instead, he pointed out, the episode was just a “mutually beneficial arrangement” between a park trying to promote itself to families and a family show trying to borrow some of Mickey Mouse’s wholesome cachet for itself.

It is, however, undeniable that the vast majority of shows that have done a Disney episode have been owned by Disney.