John Glover did not leave Smallville of his own choice the writers of the Smallville series had made the decision to write him out by making it so that his own son; Lex Luthor would murder him however the writers later brought John Glover back in Season 10 as Lionel Luthor but as Lionel Luthor from another alternate reality in which the Luthors were the one who had found and adopted Clark Kent and therefore became Clark Luthor.
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John Glover
The crediting order for the actors for Smallville's Season 5 were Tom Welling, Kristen Kreuk, Michael Rosenbaum, Erica Durance, Allison Mack, John Glover, Annette O'Toole and John Schneider.
Season 7 was the last season for Michael Rosenbaum and John Glover who respectively portray Lex Luthor and Lionel Luthor.
The crediting order for the actors for Smallville's Season 5 were Tom Welling, Kristen Kreuk, Michael Rosenbaum, Erica Durance, Allison Mack, along with actor; John Glover and actress; Annette O'Toole.
Phil Morris played Smallville's John Jones, also known as the Martian Manhunter.