Issue #157. Kitty scares the pants off the Shi'ar forces attacking Earth by disguising herself as Dark Phoenix reborn - and her only display of power is phasing up through the floor!note And this was well before Jean's first actual resurrection...
From Disassembled (2018 series)
In issue #1, X-23 takes out the entire Mutant Liberation Front single-handedly (with a magnetic Fastball Special assist from Polaris).
She tops that in the very next issue...getting swallowed by a T. rex and cutting her way out.
