Calvin Johnson makes comeback as Megatron ... in a 'Transformers' ad

There's no question Calvin Johnson is retired. The record-setting wide receiver has made that clear over and over and over again. But the name Megatron? That lives on for the former Detroit Lions wide receiver.

It's still his Instagram handle and recently, he took to playing Calvin Johnson-as-Megatron in an ad for what else? "Transformers."

Johnson posted a 30-second spot promoting the new Transformers movie, "Transformers: The Last Knight," on Wednesday night and it's pretty funny.

The premise of the ad is Optimus Prime following Johnson everywhere he goes, taunting him, not allowing him to place an order at a fast-food restaurant and telling Johnson he has "no allies" when he shows up at…