'The Flash' season 3 episode 13 spoilers, news: Grodd asks for help from Barry and his team

Barry (Grant Gustin) will be receiving an unexpected call for help from Grodd (David Sabolov). Meanwhile, "The Flash" will be having a musical crossover episode with "Supergirl," with lead actors Gustin and Melissa Benoist showcasing their singing voices.

In the upcoming 13th episode of "The Flash" season 3, titled "Attack on Gorilla City," Barry and his team will be taking a trip to Earth-2 to face Grodd, not knowing that the silverback Gorilla lured them to ask for their help.

The episode synopsis reads: "When Jesse Quick (Violett Beane) informs the team that her father (Tom Cavanagh) has been abducted, Barry, Caitlin (Danielle Panabaker), Cisco (Carlos Valdes) and Julian (Tom Felton) voyage to Earth-2 on a rescue mission to save Harry from Gorilla City. As they trek through the forest, Barry and the team are immediately captured and brought to Grodd. Grodd tells them he needs their help to stop Solovar (Keith David), the leader of Gorilla City, as Solovar wants to invade Earth-1."

While Barry, Cisco, Caitlin, and Julian will be helping Grodd out in Earth-2, Jesse and Kid Flash (Keiynan Lonsdale) will be protecting Earth-1 from a "metahuman that can control gravity," with the help of H.R. (Tom Cavanaugh) and Joe (Jesse L. Martin) manning S.T.A.R. Labs.

Meanwhile, "The Flash" season 3 will have a musical crossover episode with "Supergirl" season 2 slated to premiere on March 21 titled "Duet."

The Flash and Supergirl will be facing a villain called Music Meister that can control people through his songs, Entertainment Weekly confirmed. Actors Gustin, Benoist Martin, Valdes, Jeremy Jordan who plays Winslow, Victor Garber who plays Stein, and John Barrowman who portrays Merlyn in "Legends of Tomorrow" will be belting out their singing voices in the crossover episode.

"The Flash" season 3 episode 13, titled "Attack on Gorilla City," premieres on Feb. 21 at 8 p.m. ET on The CW.