S1·E24 The Past Revealed

Ten years ago, Frigimon found an abandoned human baby, Keenan, and took him as her son. An expedition led by Professor Spencer Damon embarked into the Digital World to search for the lost baby but found itself threatened by wild Digimon. After a brief feud, Merukimon realized that Spencer was a honest man and they made a promise that both races would cooperate with each other in the future. However, Kurata became consumed with hatred for Digimon, deeming them all evil due to the attack. Merukimon recalls and denounces him as the man responsible for the deaths of Frigimon and many other Digimon.