YMMV / Legends of Tomorrow S1E4 "White Knights"

• Complete Monster: Valentina Vostok is a Soviet physicist allied with Vandal Savage, who leads "Operation Svarog" to create a Soviet Firestorm to use against America in the Cold War. To this end, Vostok spent years experimenting on humans, resulting in countless casualties from failed experiments. After discovering Martin Stein possessed knowledge about the Firestorm project, Vostok has his friends kidnapped and thrown into a Soviet gulag. Using various methods to interrogate Stein, including a drug that causes excruciating pain, Stein finally talks upon being Forced to Watch his teammates being tortured. Discovering Stein himself is one half of Firestorm, Vostok forcibly fuses herself with him, becoming a new Firestorm, whereupon she manically fire-balls others. In a Bad Future, she creates an army of Firestorms which wipes out nearly every country by the 21st century, content with her own country being destroyed so it can be rebuilt stronger.
• Harsher in Hindsight: Martin frets over the possibility of having to go back to the present and inform Jax's family of his death if something happens to him. Jax has to tell Martin's family of his death in "Crisis On Earth-X, Part 4".