This research is based on the analysis of idioms from American television series Gotham in three languages: English as the source language and German and Croatian as two target languages. The corpus of this research consists of 15 randomly extracted idioms from the series. The research is divided in three major parts. The first part contains a theoretical background on what is phraseology and phraseological units, as idiom is one of the types of phraseological units, and how are they defined. There is also a small section on translating phraseological units. The second part of the research presents the corpus of the research and the pattern in which the analysis of the idioms is presented. The third part is the in-depth analysis of the idioms in three languages. To each analyzed idiom there is also a part with some additional information on the discussed idiom. This research also contains four appendices that are found at the end of the research. The first appendix contains the alphabetical list of the dictionaries and expressions used in this research and their abbreviations. In the second appendix is the complete list of the analyzed idioms to find in their source language – English along with their dictionary translation in the two target languages – Croatian and German. The third appendix contains the analyzed idioms with their subtitle translation in the two target languages – Croatian and German. The last appendix has a common subject which is the diagram of the frequency of equivalence in three languages. Since the research is comparing two target languages to one source language there are two diagrams presented. In the first diagram is the equivalence of Croatian idioms in comparison to the English ones while in the second the German to English equivalence.