Grodd is back on next week's episode of "The Flash," and he sounds as though he's more intelligent -- and angry -- than ever.

The first teaser and episode synopsis, both below, offer a few hints as to why he's back in Central City to face off with Team Flash for a second time.

Grodd returns to Central City and kidnaps Caitlin (Danielle Panabaker). Barry (Grant Gustin) and team race to find her before it's too late. Meanwhile, Cisco (Carlos Valdes) plans his first date with the new barista at Jitters, Kendra Saunders (guest star Ciara Renee) and Patty (guest star Shantel VanSanten) begins to suspect Barry is hiding something from her.

Starring Grant Gustin, Danielle Panabaker, Carlos Valdes and Jesse L. Martin, "The Flash" airs Tuesdays at 8 pm EST on The CW.