"Bond 25" may be bringing back an iconic villain from the past.

The upcoming film already has one major villain in Rami Malek, but why not double the trouble for Daniel Craig's 007?

Christoph Waltz, who played Ernst Stavro Blofeld in 2015’s "Spectre," was spotted on the set of "Bond 25" at London's Pinewood Studios:

In "Spectre," Blofeld was revealed to be the mastermind behind an international criminal organization, as well as James Bond’s adoptive brother.

Waltz's inclusion would create further links between "Bond 25" and "Spectre," since Léa Seydoux and Rory Kinnear are reprising their roles from the latter film as, respectively, Dr. Madelaine Swann and  MI6 chief of staff Bill Tanner.

In "Bond 25," the martini-sipping agent has left active service and is enjoying a tranquil life in Jamaica. His peace is short-lived when his old friend Felix Leiter (Jeffrey Wright) from the CIA turns up asking for help. The mission to rescue a kidnapped scientist turns out to be far more treacherous than expected, leading Bond onto the trail of a mysterious villain armed with dangerous new technology.

"Bond 25" opens in theaters April 6, 2020.