From Wikipedia:

Alice Through the Looking Glass is a 2016 American fantasy adventure film directed by James Bobin, written by Linda Woolverton and produced by Tim Burton, Joe Roth, Suzanne Todd, and Jennifer Todd. It is based on the characters created by Lewis Carroll and is the sequel to the 2010 film Alice in Wonderland, a live-action reimagining of Disney’s 1951 animated film of the same name. The film stars Johnny Depp, Anne Hathaway, Mia Wasikowska, Matt Lucas, Rhys Ifans, Helena Bonham Carter, and Sacha Baron Cohen and features the voices of Stephen Fry, Michael Sheen, Timothy Spall, Barbara Windsor, Matt Vogel, Paul Whitehouse, and Alan Rickman in his final film role.

In the film, Alice comes across a magical looking glass that takes her back to Wonderland, where she finds that the Mad Hatter is acting madder than usual and wants to discover the truth about his family. Alice then travels through time (with the “Chronosphere”), comes across friends and enemies at different points of their lives, and embarks on a race to save the Hatter before time runs out.

The film premiered in London on May 10, 2016, and was theatrically released by Walt Disney Pictures on May 27, 2016. Alice Through the Looking Glass received generally negative reviews from critics, with praise for its performances and visual effects, but criticism for its lack of originality, story and characters. The film had grossed $299 million on a budget of $170 million.

The film is dedicated to Rickman, and was released four months after his death on January 14, 2016.