The character returns in "Mass Effect 3", providing he survived the suicide mission in the previous game. After defeating the Collectors, Mordin returned to STG as a special consultant, whilst also working as an inside source for Clan Urdnot. If Maelon's research data was saved, he uses it to aid in the treatment of the surviving female krogan codenamed Eve, the only survivor of his student's experiments. He is encountered on the salarian homeworld, Sur'Kesh, when Shepard is sent there to aid in the evacuation of the female.