Why John Glover Left Smallville After Season 7

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John Glover starred in the DC Universe series Smallville for seven seasons as Lionel Luthor. The actor, who featured in some of Smallville's most rewatchable episodes, gave a wonderfully twisted performance as the father to Lex Luthor. Seeing Michael Rosenbaum's Lex develop throughout the series was dramatic and effective, but many of the roots that worked in Smallvilles Lex were planted by his dynamic with his manipulative father. Glover played a complex and detailed character who oscillated between sympathetic and monstrous throughout the series. Much of his character's effectiveness came from Glover's performance.
Karlis Wilde

https://screenrant.com/why-john-glover-smallville-exit-explained/