Amazing Regular Time

Amazing Regular Time is a direct-to-video crossover TV special on Cartoon Network. It was a crossover between three Cartoon Network shows, The Amazing World of Gumball, Regular Show and Adventure Time.

The Amazing World of Gumball
Gumball Watterson (voiced by Jacob Hopkins), a 12-year-old blue cat who lives with his family in the fictional American city of Elmore. He attends Elmore Junior High in the seventh grade along with his adoptive brother and best friend Darwin.

Darwin Watterson (voiced by Terrell Ransom, Jr.) is a goldfish and Gumball's best friend and adoptive brother. Initially given to Gumball as a pet, Darwin later sprouted legs and subsequently became a full member of the Watterson family.

Anais Watterson (voiced by Kyla Rae Kowalewski) is a pink rabbit, Anais is Gumball and Darwin's 4-year-old sister. She is incredibly smart for her age, to the point that she attends Elmore Junior High with her brothers.

Nicole Watterson (voiced by Teresa Gallagher) is a blue cat who is responsible for the upkeep of her family, performing house chores and working long hours at The Rainbow Factory.

Richard Watterson (voiced by Dan Russell) is a pink rabbit and stay-at-home dad, Richard spends most of his time sleeping, eating, and watching television.

Trivia

 * It was aired on Spring 2015.