| "Operation Mongoose" | |
|---|---|
| Once Upon a Time episodes | |
| Episode nos. | Season 4 Episodes 22 & 23 |
| Directed by | Romeo Tirone (part 1) Ralph Hemecker (part 2) |
| Written by | Edward Kitsis and Adam Horowitz |
| Production code | 421 & 422 |
| Original air date | May 10, 2015 |
| Guest appearances | |
| |
"Operation Mongoose" is a two-part story comprising the twenty-second and twenty-third episodes of the fourth season of the American fantasy drama series Once Upon a Time, both of which aired on May 10, 2015. Both episodes served together as the fourth season finale.
In this episode, Isaac becomes a wild card in Gold's scheme to change everyone's destiny as Emma, Regina, Mary Margaret, Hook, and David attempt to stop them. When Gold and Isaac forge ahead with their plans, they alter the destiny of everyone involved. Now, it's up to Henry to reverse the outcome and restore the destiny of his family, after he is drawn into the chaos, before it is too late.