Finally, the crossover of a lifetime

I'm starting at last with the drawings some at Instagram suggested some time ago, the first one being Peter Griffin, as suggested by (who also made the second image)

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When in Quahog...
's screenshot (whose normal garb includes a brown courderoy jacket, sweater vest, & black rimmed glasses) actually came from a episode! Sadly, I have no idea which one. Please help us solve this mystery

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