Los Angeles, the summer of 1981. John Holmes (Kilmer) is at the end of an extraordinarily prolific career as the world's biggest porn star. In a state of financial and pharmaceutical ruin, Holmes is now devoted to his teenage girlfriend Dawn (Bosworth) while still married to his wife Sharon (Kudrow).

Increasingly involved with a gang of local drug dealers on Laurel Canyon's Wonderland Avenue, Holmes finds himself unwittingly drawn into a dangerous world of gangland rivalry and violence. After the home of the notorious crime boss becomes the focus of their criminal activities, members of the Wonderland gang are found brutally murdered. Can a fading porn star have turned into a calculating killer?

Based on a true story, Wonderland unflinchingly captures the shocking sights, sounds and sensations of L.A.'s sleazy underbelly in the 1980s.