Barry, Caitlin and others in “Unfinished Business”

Barry

What happened to Grodd?

Caitlin

We don't know. After the Particle Accelerator exploded, I went down to check on him, and his cage was empty.

Joe

So he could have been affected by the same energy that hit Barry?

Cisco

When the dark matter hit Grodd, all the drugs and serums that Eiling injected him with could've activated. Maybe the Accelerator explosion created a meta-gorilla. I think we know what happens when a super-intelligent ape who's pissed off at humans escapes captivity.

Caitlin

Cisco's right about the first part.