Aidan Gallagher (September 18, 2003) is an American actor. His first major role was portraying one of the quadruplet brothers, Nicky Harper, in the Nickelodeon television series Nicky, Ricky, Dicky & Dawn. In 2019 Gallagher began portraying Number Five in the Netflix series The Umbrella Academy. Gallagher first appeared in a minor role in a 2013 episode of Modern Family. He was in two short films, You & Me and Jacked Up. He then landed a major role in Nickelodeon's Nicky, Ricky, Dicky & Dawn as Nicky Harper, for which he was nominated Favorite Male TV Star in the Nickelodeon Kids' Choice Awards in 2016 and 2017. He was in the show for four seasons until it ended in 2018. In 2017, he was cast in the role of Number Five in The Umbrella Academy, which was released in February 2019 on Netflix.