On September 27th, 2018, it was announced that Marnos was invited to join the contest and accepted their invitation. On September 30th, it was announced that Bea Miller was internally selected to represent the nation with the song "Fire N Gold".
On October 28th, 2018, the Marnonian Broadcasting Authority (MBA) confirmed the nations participation for ZSC10. It is highly likely that the nation will again internally select their entry. It was announced on November 14th that the girl group HAIM with the song "Want You Back" would be their entry.
On December 2nd, 2018, the MBA confirmed the nations participation for ZSC11 when the broadcaster announced it has shortlisted five songs in the countries internal selection. It was announced on December 23rd, 2018 that Fletcher with the song "Wasted Youth" would represent the the nation.
On January 30th, 2019, immediately after the nation's first ever non-qualification, the MBA confirmed their participation for ZSC12. It was also announced that the national final Our Song would return for its second edition and be used to select the entry. On February, 21st, 2019, Loote won the national final with the song "Your Side Of The Bed".
On March 16th, 2019, the MBA confirmed that Marnos would partcipate for the 13th Edition of The Zendari Song Contest. Along with their participation, it was also announced that the national final Our Song would not continue for its third edition due to time constraints. It was announced on March 29th that Matoma & Josie Dunne would represent the nation with the song, "Sunday Morning".
On April 29th, 2019, the MBA confirmed that Marnos would partcipate for the 14th Edition of The Zendari Song Contest. For the first time ever, it was confirmed that the entry would be in Hebrew after the nation's victory in the 3rd Edition of Themedari with a song in Hebrew. It was then confirmed that Shaked Malcho would represent the nation with the song "How Dare I" after being recommend by Carakukly who declined the offer to represent the nation in the main contest, who wanted to go to Zendarifestivalen 10.