• xall-in show,
• vall-in show,
• fall-in show,
• dall-in show,
• czll-in show,
• csll-in show,
• cwll-in show,
• cqll-in show,
• cakl-in show,
• capl-in show,
• caol-in show,
• calk-in show,
• calp-in show,
• calo-in show,
• call0in show,
• callpin show,
• call-un show,
• call-jn show,
• call-kn show,
• call-on show

The adjective form of the phrase "call-in show" is "call-in".

The plural form of "call-in show" is "call-in shows"

The singular form of the word "call-in show" is "call-in show". The word remains the same in both singular and plural because it is a compound noun that does not change when pluralized.