Roach (?) in bioactive gargoyle gecko setup

I occasionally check underneath my cork bark to see how my isopods are doing. I originally got some Christ church isopods which didn’t do well. Got some dairy cows which didn’t do well. Then finally some powder orange ones which are (were?) doing great!

Went to check on them and bam a gigantic roach or something was just there. What do i do? I’m legitimately terrified rn. Boyfriend swears it had to have come from inside our house but I’ve never ever seen one inside our house. We have the occasional silverfish and a bunch of crickets but that’s all I’ve ever seen in the house.

So first of all, is it possible it came in as a baby with my other isopods?

Second, what the h*ll do I do?

It was black with some red/brown spots on its back? Not entirely sure I didn’t get a great look. I’ve never fed my gecko Dubai roaches before. I only feed Pangea and crickets.

Edit: here’s a link to a photo of the roach or whatever it is. It’s the best photo I was able to get