His presence on set has been “essential,” the “Indiana Jones” actor told Variety in an interview published Wednesday, saying that Fox “gives me both a physical representation of the disease to inform myself with, but more than that, he allows me to believe that Paul could believe that he could be adequate to the challenge.”

Harrison Ford recently heaped praise on Michael J. Fox, gushing over the latter’s behind-the-scenes role in Shrinking. In a recent interview, Ford opened up about how Fox’s perspective has shaped his portrayal of Dr.

Fox came out of retirement to star in the series, which features Ford as a therapist who has Parkinson's disease