| "Lysergic Acid Diethylamide" | |
|---|---|
| Fringe episode | |
&sq=Qlik&lang=&file=File:Fringe_lsd_cartoon_screenshot.jpg) Peter (left) and Walter marvel at the animated world inside Olivia's mind while talking to William Bell (right) | |
| Episode no. | Season 3 Episode 19 |
| Directed by | Joe Chappelle |
| Story by | Jeff Pinkner J. H. Wyman Akiva Goldsman |
| Teleplay by | J. H. Wyman Jeff Pinkner |
| Production code | 3X6119 |
| Original air date | April 15, 2011 |
| Guest appearances | |
| |
"Lysergic Acid Diethylamide" is the 19th episode of the third season of the American science fiction drama television series Fringe, and the 62nd episode overall. The narrative followed the Fringe team's attempts to extract William Bell from Olivia's brain by entering her mind with the help of LSD.
The episode's teleplay was co-written by J. H. Wyman and Jeff Pinkner, while Wyman and Pinkner co-wrote the story with Akiva Goldsman. Joe Chappelle served as director. It marked the return of previous guest actor Leonard Nimoy, who had announced his retirement the previous year. Production of the animated portions was completed by Zoic Studios in an eight-week effort, the largest amount of work hours required to produce a Fringe episode.
The episode first aired on April 15, 2011 in the United States on the Fox network. An estimated 3.6 million viewers tuned in, helping the episode earn a 1.4 ratings share for those 18–49, tying a series low. Critical reception was generally positive, as multiple reviewers praised the creativity of the writers.