CW DC Synopses May 8-10

Here are the Arrowverse episode descriptions for three weeks from now

Supergirl 2x20 "City of Lost Children"

“THIS IS US” STAR LONNIE CHAVIS GUEST STARS – When an alien attacks National City, Supergirl (Melissa Benoist) and the DEO learn the alien is a Phorian, an otherwise peaceful race with telekinetic powers. Guardian (Mehcad Brooks) gets a lead on the Phorian’s address but instead of finding the culprit, he finds a very scared boy named Marcus (guest star Lonnie Chavis). Marcus will only trust James so it is up to Guardian to stop the attacks on the city. Rhea’s (Teri Hatcher) plan escalates. Ben Bray directed the episode with story by Robert Rovner and teleplay by Gabriel Llanas & Anna Musky-Goldwyn (#220). Original airdate 5/8/2017.

The Flash 3x21 "Cause and Effect"

DRASTIC TIMES CALL FOR DRASTIC MEASURES – Barry (Grant Gustin) takes drastic measures to stop Savitar. Meanwhile, H.R. (Tom Cavanagh) continues to push Tracy Brand (guest star Anne Dudek) to design the trap for Savitar and Killer Frost (Danielle Panabaker) returns with an interesting proposal. David McWhirter directed the episode written by Judalina Neira & Lauren Certo (FLA321). Original airdate 5/9/2017.

Arrow 5x21 "Honor Thy Fathers"

CHASE CONTINUES TO TORMENT OLIVER — Oliver (Stephen Amell) returns to the mayor’s office and faces one of his most pressing issues yet – the forced release of dozens of violent criminals prosecuted by Adrian Chase (Josh Segarra). Meanwhile, a crate is delivered to Oliver’s office containing a mysterious corpse encased in concrete. Laura Belsey directed the episode written by Marc Guggenheim & Sarah Tarkoff (#521).  Original airdate 5/10/2017.