Relaciones Peligrosas, originally known as Fisico o Quimica, is a Spanish-language telenovela produced by United States-based television network Telemundo Studios, Miami. It is an adaptation of the Spanish television series Física o Química. It has Sandra Echeverría, Gabriel Coronel, Maritza Bustamante, Gonzalo García Vivanco, Jonathan Freudman, Mercedes Molto, Carlos Ferro, Daniela Navarro, Renato Rossini, Kevin Aponte and Ana Layevska in the leading roles of the plot.

A girl finds her life and dignity being destroyed by perverts and criminals on a pornographic website, so she decides to fight back, but she has no idea who to trust anymore.

When a supernatural cult threatens Earth, Alice must assemble a team of fairy tale villains to face the literal forces of Death.

Sandy's past transgression, with her fiance's best friend Roman, comes back to haunt her when he becomes their best man. Roman is mentally unbalanced and determined to make Sandy his own bride.