While David Bowie is one of the few celebrities who never lent his voice to an episode of The Simpsons, exec producers Al Jean and Matt Selman sharesa tribute to the late rock icon, recalling when Springfield news anchor Kent Brockman dressed up in full Ziggy Stardust regalia. In addition, Jean also shares a “Simpsons tribute to a genius.”;

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Meanwhile, the show also shared a short tribute to Alan Rickman, who passed away a few days after Bowie’s death, tweeting a video clip from an episode featuring a Love, Actually parody in which former Doctor Who star Matt Smith provides the voice of Rickman’s Harry Potter character, Professor Severus Snape, while “All the Young Dudes”; (which was written by Bowie) plays in the background.

The Simpsons airs Sundays at 10 p.m. ET/PT on Global; you can also watch full episodes online.