A Blacklister from Coopers past returns with a deadly delivery.

In a prison cafeteria, the head of a gang is warned rivals are coming to get him.

He seems nonplussed for good reason, it turns out.

The Blacklist

James Spader on ‘The Blacklist’ season 10.Will Hart/NBC

The question, of course, is where did a prisoner get an automatic weapon?

When she leaves for school, Cooper immediately goes in on Red aboutthe events of last week.

In case you were unsure, he’s still mad.

The Blacklist

Harry Lennix as Harold Cooper.Will Hart/NBC

Filling Cooper in on the prison shooting, Red explains he believes the gun was delivered by the Postman.

The smuggler is known for being able to sneak contraband into prisons.

Red keeps speaking but it’s clear from the shock on Cooper’s face that he’s stopped listening.

The Blacklist

Sami Bray as Agnes.Will Hart/NBC

The case is Maryland v. Lawrence Nelson.

There is one holdout a very young Harold Cooper (Ruffin Prentiss).

He gets convinced of Nelson’s guilt and the future Postman serves 25 years.

Back at TFHQ, Cooper fills the team in on their latest target.

Reader, it most certainly is not.

I bet Dembe is mostly mad Chuck got to be at the showdown and he didn’t.

“Did I miss anything?”

Cooper is not amused.

“Just your first morning of your trial employment period?”

You gonna lock me up for a long time?"

Touche, bad guy!

Meanwhile, another prisoner is in his cell doing a full-on Bill Nye the Science Guy impersonation.

Nelson is working in his own lab space when the call comes in.

Eugene, the prisoner, says he needs more materials to get the “compound” pure enough.

He needs another delivery.

The Postman promises to deliver the next day.

Okay, the Postman has already one-upped Comcast and now he’s coming for Amazon.

Malik is tracking down the payment for the gun and runs into trouble getting the bank to help.

Usually that works beautifully.

This time, the bank manager is too dumb to get it.

So Red pulls out a gun and threatens to shoot his kneecaps.

Cranking up the sound, Herbie has cracked the case the hum of a drone is in the background.

He also always maintained his innocence.

Herbie finally makes it into the office, so Baby Sue must be feeling better.

Which is 75 times more lethal than ricin, so that’s fun!

Dembe figures out the numbers on the orders are actually inmate numbers.

It’s too late, though; Eugene has already smuggled the completed abrin back out to the Postman.

This is a revenge abrin-ing!

Red sets off to re-bribe whoever was pre-bribed to help the Postman deliver himself to the building.

Nothing is going to get his 25 years back.

We end on another adorable duo: Red and Agnes.