Zapp-Leela relationship

The relationship between Zapp Brannigan and Turanga Leela is a recurring theme on Futurama.

Development
The initial beginnings of this relationship starts in "Love's Labours Lost in Space", where Leela accidentally, out of pity, sleeps with Zapp Brannigan. Interestingly, before this event, Leela was actually a fan of Brannigan, but when Brannigan tries to score her back, she becomes furious with him.

On the other hand, Zapp becomes very cocky after having her sleep with him, and would so, on further occasions, constantly believe he still has a chance. The relationship (and the event) was referenced numerous times by Bender in the first and second season. After that it purely becomes a joke appearing less and less.

In the comics, Zapp occasionally loses intrest in Leela, to which Leela actually becomes upset.

In "In-A-Gadda-Da-Leela", Leela and Zapp were lost together at Lo'ihi Island, and Zapp made Leela believe they were on another planet and that they were out of water so she accedes to make love. Leela then realized Zapp was lying, but they later were forced to make love by V-GINY to save Earth.

Appearances

 * Episodes where their actions between these characters based on the event, as well as references by other characters.