The song was performed by Saara Aalto, who was internally selected by the Finnish broadcaster Yleisradio (Yle) in November 2017 to represent the nation at the 2018 contest in Lisbon, Portugal.

The national final Uuden Musiikin Kilpailu 2018 was organised in order to select the song that Aalto would perform.

In the 2017 contest, "Blackbird" performed by Norma John failed to qualify Finland to the final, placing twelfth in the semi-final.

[2] Finland's entries for the Eurovision Song Contest have been selected through national final competitions that have varied in format over the years.

Along with their participation confirmation, the broadcaster also announced that the Finnish entry for the 2018 contest would be selected through Uuden Musiikin Kilpailu 2018.

[3] Yle announced that they had internally selected singer Saara Aalto to represent Finland in Lisbon during a live streamed press conference on 7 November 2017, hosted by 2013 Finnish Eurovision entrant Krista Siegfrids and Mikko Silvennoinen.

[3] Saara Aalto also made several appearances across Europe to specifically promote "Monsters" as the Finnish Eurovision entry.

On 14 April, she performed during the Eurovision in Concert event which was held at the AFAS Live venue in Amsterdam, Netherlands and hosted by Edsilia Rombley and Cornald Maas.

[11] Between 5 and 25 April, Aalto took part in promotional activities in London, United Kingdom where she performed during the London Eurovision Party, which was held at the Café de Paris venue and hosted by Nicki French and Paddy O'Connell, and during her Eurovision Wonderland concert, which was held at the Under the Bridge venue.

The four backing performers that joined Saara Aalto on stage were Heli Lyytikäinen, Kane Horn, Tuuli Ikonen and Yves Cueni.

Each nation's jury consisted of five music industry professionals who are citizens of the country they represent, with their names published before the contest to ensure transparency.

This jury judged each entry based on: vocal capacity; the stage performance; the song's composition and originality; and the overall impression by the act.

In addition, no member of a national jury was permitted to be related in any way to any of the competing acts in such a way that they cannot vote impartially and independently.

The individual rankings of each jury member as well as the nation's televoting results were released shortly after the grand final.