Upananda is an warrior-associate of Skanda-Kārtikeya (Kartikeya). He helped Skanda while slaying Tārakāsura (Tarakasura).

Mahābhārata (Kinjawadekar)(9.45.64)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(9.42.52; see footnote, vol.29, p.476)