Krishna also showed his Vishwaroopa to Sage Uttanka after the Kurukshetra war.
Vaisampayana continued, 'Gratified with him, the holy one then showed Utanka that eternal Vaishnava form which Dhananjaya of great intelligence had seen. Utanka beheld the high-souled Vasudeva's
universal form, endued with mighty arms. The effulgence of that form
was like that of a blazing fire of a thousand suns. It stood before
him filling all space. It had faces on every side. Beholding that high
and wonderful Vaishnava form of Vishnu, in act, seeing the Supreme
Lord (in that guise), the Brahmana Utanka became filled with wonder.'
Anugita Parva, Section LV