Thomas says he consulted with a scientist named Louise Lincoln, who in the comics held the Killer Frost mantle before Caitlin Snow, Louise was a friend of Crystal Frost, who essentially gave herself the woman's powers after her death. The Louise version of Killer Frost proved to be a pretty major foe throughout the years, even appearing in recent comics such as Doomsday Clock.
Makhent was known as Icicle, a villain of Green Arrow, and is also the son of Joar Mahkent, the Golden Age's Icicle.
The Icicle first appeared in DC Comics 'All-American Comics" # 90 in 1947.
The name of this episode comes from the play The Iceman Cometh. The title is also similar to the Flash: Season Zero comic book issue "The Strongman Cometh."
At the end of Nora (2018), it was revealed that Thomas Snow's (Icicle's) death certificate was signed by Cameron Mahkent, who is the DC Comics' version of Icicle.