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Jellygnite is a jellyfish badnik exclusive to the 2013 remake of Sonic the Hedgehog 2.
Jellygnite can found in the underwater sections of Hidden Palace Zone. It has an attack pattern similar Chemical Plant Zone's Grabber, catching the player in its tentacles before self-destructing a short while later. It is possible to escape Jellygnite's tentacles by repeatedly pressing and .
Jellygnite reappears in Sonic Mania's Hydrocity Zone, once again inhabiting the underwater sections of the stage. This version of the badnik functions identically to its Sonic the Hedgehog 2 counterpart.