"Shrek Forever After" is the fourth installment in the Shrek film series, released in 2010. The story follows Shrek, who is feeling overwhelmed by his responsibilities as a husband and father. In a moment of frustration, he makes a deal with the cunning Rumpelstiltskin, which leads to an alternate reality where Shrek never existed. In this new world, Rumpelstiltskin has taken control, and Shrek must team up with his friends, including Donkey and Fiona, to restore the original timeline. The film explores themes of identity, family, and the importance of appreciating what one has.