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Gallery: 4/5
That photo above shows Pops (George Segal) holding a piece of cake. We're not sure why, so we'll have to watch to find out.
The new episode will also include an appearance from Coach Mellor (Bryan Callen), who was at the center of the week's big Goldbergs news. The Hollywood Reporter has confirmed that Callen will star in a spin-off set in "1990s-something." It will be about two high school teachers who become father figures to three misfit kids. (ABC/Eddy Chen)