Seriously, I wasn't paying attention for like five minutes and then they spring this nightwing thing on me......
WTF?

Oh when supergirl and Powergirl went to Kandor, SG was disguised as Flamebird and PG was disguised as nightwing

^_^

Also worth of mention:

The original Nightwing and Flamebird were Kryptonian superheroes which resembled Batman and Robin, those disguises were later taken by Clark Kent and Jimmy Olsen when they went to Kandor. Years later Dick Grayson and Bette Kane took the names.

Now two new kryptonians carry those names at the same time

"Also worth of mention:

The original Nightwing and Flamebird were Kryptonian superheroes which resembled Batman and Robin, those disguises were later taken by Clark Kent and Jimmy Olsen when they went to Kandor. Years later Dick Grayson and Bette Kane took the names.

Now two new kryptonians carry those names at the same time"

"Oh when supergirl and Powergirl went to Kandor, SG was disguised as Flamebird and PG was disguised as nightwing

^_^"