Glenda Jackson (b. 1936) is an Oscar-winning British actress and former politician. She was the guest star on The Muppet Show episode 507. Unlike some guest stars, Jackson insisted to the producers that she was ready to perform any material they had in mind, giving them a free hand for an especially bizarre episode.
She won the 1974 Best Actress Academy Award for her role in A Touch of Class. She has been nominated for a Tony Award four times, and won in 2018 for her performance in Edward Albee's Three Tall Women.
She retired from entertainment to become a politician in 1992, and was elected as a British Labour Party MP. She served five terms as MP for Hampstead & Highgate until 2015 before stepping down to return to acting.