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Big Mike sitting on the Heck's couch
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Big Mike with a blowtorch
Michael "Big Mike" Heck Sr. is the father of Mike Heck and Rusty Heck and the grandfather of Axl Heck, Sue Heck and Brick Heck. He is a widower and a hoarder who tends to keep to himself and very rarely leaves his house, and is very stubborn at times (proven in Thanksgiving and Thanksgiving II when Mike had to beg him to come over to the Heck's House )
He is portrayed by John Cullum