"O King, when the demon Kalanemi, who was carried by a lion, saw that the Supreme Personality of Godhead, carried by Garuda, was on the battlefield, the demon immediately took his trident, whirled it and discharged it at Garuda's head. The Supreme Personality of Godhead, Hari, the master of the three worlds, immediately caught the trident, and with the very same weapon he killed the enemy Kalanemi, along with his carrier, the lion.
Purport: "Kalanemi and all the other demons were killed by the Supreme Personality of Godhead, Hari, and when Sukracarya, their spiritual master, brought them back to life, they were again killed by the Supreme Personality of Godhead."
"In his previous birth Kamsa was Kalanemi, a demon killed by Visnu. Consequently, Kamsa became a great enemy to all the descendants of the yadu-vamsa, the Yadu dynasty. He even arrested and imprisoned his own father, Ugrasena, for Kamsa wanted to enjoy the kingdom alone."
Srimad-Bhagavatam 10:1 Summary
"Formerly an asura named Kalanemi had six sons, named Hamsa, Suvikrama, Kratha, Damana, Ripurmardana and Krodhahanta. They were known as the sad-garbhas, or six garbhas, and they were all equally powerful and expert in military affairs. These sad-garbhas gave up the association of Hiranyakasipu, their grandfather, and underwent great austerities to satisfy Lord Brahma, who, upon being satisfied, agreed to give them whatever benediction they might desire. When asked by Lord Brahma to state what they wanted, the sad-garbhas replied, "Dear Lord Brahma, if you want to give us a benediction, give us the blessing that we will not be killed by any demigod, maha-roga, Yaksa, Gandharva-pati, Siddha, Carana or human being, nor by great sages who are perfect in their penances and austerities." Brahma understood their purpose and fulfilled their desire. But when Hiranyakasipu came to know of these events, he was very angry at his grandsons. "You have given up my association and have gone to worship Lord Brahma," he said, "and therefore I no longer have any affection for you. You have tried to save yourselves from the hands of the demigods, but I curse you in this way: Your father will take birth as Kamsa and kill all of you because you will take birth as sons of Devaki." Because of this curse, the grandsons of Hiranyakasipu had to take birth from the womb of Devaki and be killed by Kamsa, although he was previously their father. This description is mentioned in the Hari-vamsa, Visnu-parva, Second Chapter. According to the comments of the Vaisnava-tosani, the son of Devaki known as Kirtiman was the third incarnation. In his first incarnation he was known as Smara and was the son of Marici, and later he became the son of Kalanemi. This is mentioned in the histories."
Srimad-Bhagavatam 10:1:69 Purport
Bhaktivedanta Book Trust. Excerpted from texts and purports of HDG A.C. Bhaktivedanta Swami Srila Prabhupada.