Beth Rhinelander, left, of Oakland and Shara Marquis of Waterville don Patrick Dempsey paper masks Sunday as they cheer for riders in the Dempsey Challenge.

Cyclists begin the 100-mile ride Sunday in the Dempsey Challenge.

Cyclists start their ride Sunday on the third day of the Demsey Challenge in Lewiston.

The last wave of cyclists waits Sunday to begin its ride on the third day of the Dempsey Challenge.

Levi Daniels awaits the start of his ride Sunday on the third day of the Dempsey Challenge in Lewiston. At 4 years old, Daniels is the youngest rider participating in the challenge this year.

Cyclists start their ride Sunday as a hot air ballon floats overhead on the third day of the Demsey Challenge in Lewiston.

Susie “Q” Morton, a survivor with stage 4 breast cancer from Woodstock, Illinois, is excited Sunday to ride in the Dempsey Challenge in Lewiston.

A cyclist speeds Sunday down Ferry Street in Lewiston on the third day of the Dempsey Challenge.

Amy Finn jokes Sunday with Scott Woodcock at the starting line of the 100-mile ride in the Dempsey Challenge.

Mary Dempsey, center, founding member of the Dempsey Center and sister of Patrick Dempsey, welcome cyclists Sunday to the third and final day of the Dempsey Challenge.

Patrick Dempsey cheers for participants virtually Sunday of the third day of the Dempsey Challenge in Lewiston. Dempsey is in Italy filming a movie and participated remotely.

Cyclists ride Sunday along the River Road during the third day of the Dempsey Challenge in Lewiston.

Cyclists reach the top of a long hill Sunday during the third day of the Dempsey Challenge in Lewiston.