Power Rangers surprise kids battling cancer

PHILADELPHIA, Pennsylvania -- Who has the real strength in this photo?

Children battling cancer at the Children's Hospital of Philadelphia (CHOP) got a visit from some action heroes this week.

The Mighty Morphin Power Rangers washed the windows outside the hospital.

Children made signs and waited at the windows to welcome their visitors.

In this photo, you see a patient in the oncology unit flex their muscles, making you wonder who the real hero is.

The window washers visit the hospital each year and dress up in costumes for the patients. In the past they've appeared as ninja turtles, Spider Man and even the gang from Sesame Street.

Go Go Power Rangers!