Thanks a Million

Singer Jennifer Lopez starts the chain of kindness by celebrating an inspiring young fan and her mother.

Hospital staff members help actor Kevin Hart recover from a serious car accident, and he's back to return the favor and to encourage the staff to do the same.

Singer Nick Jonas surprises longtime fan and mental health awareness advocate Carla, who in turn repays the kindness with a visit to her old high school drama teacher.

Actress Kristen Bell shows her appreciation for a preschool teacher who taught her a lot about motherhood.

NFL football player Aaron Rodgers is ready to return the favor to a mentor who helped him believe he could get there.

Actress Yara Shahidi kicks off this chain by honoring the legacy of childhood friend Cameron Boyce.

Actor Tracy Morgan overwhelms an aspiring gym owner; later, this community leader gets to pay it forward with an old friend.

NBA basketball player Anthony Davis thanks a Los Angeles graffiti artist for welcoming him to the city when he was traded to the Lakers.

Model Karlie Kloss surprises a former student of her Kode With Klossy camp, and this proud pupil has another mentor she'd like to thank.

Comic Gabriel Iglesias remembers a speech teacher, June, who helped him overcome some serious issues; now, she's at a taping of his show and in for a big surprise.