Yes
yes
John Wayne introduced the first episode of gunsmoke.
He was a guest star in gossp girl.
Best I can remember after watching Gunsmoke for years on end, I can't remember James Arness not appearing in a single episode, if only for just a opening or closing scene. There were episodes that were not focused on him, but he appeared in each episode.
Yes
yes
its posiple
I'm not sure but he's probably gonna guest star for icarly
Nope
yes
Yes, he played in it as 3J.
No, Mary Scheer never appeared on Scrubs.
John Wayne introduced the first episode of gunsmoke.
No, but Meghan would love that.
Willie Aames stared in Charles in Charge. He also played parts in Gunsmoke and shows on the Wonderful World of Disney. He guest starred on the Walton's and other television series.
A guest star is usually a recurring character and a special guest star is usually somebody famous appearing for one episode. Hope i helped!