About as satisfying as watching Morgan Edge snivel right up to the end.
Alexs bedside manner is soothing yet encouraging as she assures Sam that theyll figure it out.
The scans yield nothing unusual, so Alex draws blood to send to a specialist.

Credit: Diyah Pera/The CW
The needle, which I assume is just a run-of-the-mill medical instrument, punctures Sams skin just fine.
And could Worldkillers be Kryptonian genetic hybrids, as the DEO hypothesizes?
(Foreshadowing, perhaps?)
Truly, Ive seen tougher security at county fair beer tents.
But when James catches him, a mystery bullet drops the poisoner before he can answer any questions.
Edge denies trying to poison her, although hes bummed that she didnt die.
Guardian tosses Edge into the windshield of a nearby car and departs.
But Kara beats herself up over not being proactive in tracking down the other Worldkillers.
It may be cheesy, but Imalwayshere for characters reminding Kara of what Supergirl means to the world.
At Jonns suggestion, Kara returns Lena to CatCo so she wont come to in a super-secret government facility.
Lena wakes up and shares the strange dream she had about flying while Kara carried her.
When she arrives there, Lillian Luthors waiting to congratulate her daughter on following the breadcrumbs.
Lillians back, yall!
Lillians there because that man has picked on the wrong family.
Why would you want to be Cat Grant when you could be Lena Luthor?
Shes…shes got a point, honestly.
Lena says okay, but scopes out the equipment her mother has assembled.
Lena corners Edge and tells him about her mothers plans.
Panicked now, he blurts his confession about the poisoning and attempted murder into Lenas recorder.
And then Lillian dramatically ups the awesome by donning a Lexosuit.
(Think Iron Man, but green and cuter.)
Suddenly, Supergirl is there, joined by Mon-El and Guardian.
Guardian and Lena whale on Edge while the aliens take on Lillian.
My names on the building.
YESSSS, I LOVE SWAGGERING BOSS-LADY LENA!
All of your friends are secret-keepers.
Then she says goodbye to Lillian, whos strapped to a stretcher and under arrest.
And the episode ends with progress on the Worldkiller front.