"The Flash" is certainly not making any attempt to hide the fact that Grodd (David Sobolov) is returning in the CW series' second season. The promos for episode 7 put the psychic, super strong gorilla front and center and the episode is even titled "Gorilla Warfare." It will come as no surprise when Grodd comes storming back into Central City to cause more trouble for a currently-crippled Barry (Grant Gustin) and the S.T.A.R. Labs team. It will come as a surprise to Patty Spivot (Shantel VanSanten), who has no idea a giant gorilla is out there who once took her partner hostage. However, it is Patty who stumbles onto Grodd's trail in a new sneak-peek video for episode 7. 

In the teaser video, Joe (Jesse Martin) gets a phone call from Patty telling him that she just got the analysis back on some hair samples they found from the scene of a robbery where a stash of intelligence-enhancing drugs were stolen -- sound like Grodd? She says there is something strange about the samples, though, they are not human hair. Joe knows what is going on immediately and cuts her off, saying, "They are from a gorilla." Patti is left wondering how Joe seems to know who they are looking for, while Joe runs off to warn Barry and Cisco (Carlos Valdes). 

Watch the sneak peek video below: 

The promo for the episode reveals Patty does know a little bit about Grodd. "I've heard this urban legend of a gorilla that lives in the sewer systems," she says. However, it is becoming more and more clear that Barry and Joe are hiding something from her and the synopsis for the episode reveals she is getting suspicious. Unfortunately, the summary also reveals that Grodd will kidnap Caitlin (Danielle Panabaker) forcing Barry to figure out a way to save her despite the fact that he does not currently have his speed. 

Watch the promo for episode 7 below:

Grodd has not appeared since a subway train knocked him out of commission so Barry could save Joe back in Season 1. This should be fun! "The Flash" airs Tuesdays at 8 p.m. EST on the CW.