"Sherlock" actress Lara Pulver and "iZombie" actor Bradley James have signed on to join cast Theo James and Kate Beckinsale for "Underworld 5."

"In addition to playing Irene Adler on the BBC's Sherlock, Lara Pulver has appeared on TV series like 'True Blood' and 'Da Vinci's Demons' and has been on the big screen in feature films like Edge of Tomorrow and Language of a Broken Heart," said Coming Soon.

"There's no word yet on who she'll be playing in Underworld 5, but check back for full details when official plot information becomes available," it said.

Meanwhile, Bradley James was cast as the baddie in "Underworld 5" to fight Kate Beckinsale's Selene and Theo James' David.

The film will start production this month in Prague in time for the release date of Oct 21, 2016.

According to We Got This Covered, Theo James' character, David, will be the focus of "Underworld 5."

"Cory Goodman (Priest, The Last Witch Hunter) will be penning the script for Lakeshore Entertainment," it said. "No additional details on what the fifth film will be about, but we'll probably learn more when the two new female roles, casting for which is currently underway, are filled."

The Hollywood Reporter said that Theo James had to return as cast in "Underworld 5."

"Sources say there was an option on James because of his work on the previous film, and he'll star opposite two new female characters. Casting is underway for those roles, with plans to start shooting in the spring," it added.

The film will clearly benefit from Theo James skyrocketing fame after playing Four in the "Divergent" series. It's yet to be seen if that fame will translate to box-office records for the fifth installment in the vampire franchise.

Watch out for more cast, news and rumors for "Underworld 5" which will be published here when they come along.