User:CLM&MsYum

I don't know how these kinda things usually work. I've never tried to write a wiki thing. It all started because I wanted to post a simple question. A question about M&Ms voice casts. On a current wiki page it has the actors name and character and the dates of performances. My is how can a character like say Red be voiced by Billy West and listed as current voice. Than also say Jon Lovits is original through currently?