Gotham Season 2 Episode 20: Unleashed
Tabitha Galavan was said to be a version of Tigress, a name used by a long line of DC Comics villainesses. The first Tigress was created by Fred Guardineer in Action Comics #1 (1938). She was the primary villain of Zatara, the Golden Age Magician hero. He is known better today as Zatanna’s father. Both spoke their spells through a form of backwards talk. The second Tigress was Paula Brooks. Her first appearance was in Sensation Comics # 68 (Aug 1947) by Mort Meskin as the Huntress. She fought against the Justice Society of America as a member of the Injustice Society. She at one point married the villain Sportsmaster. Post Crisis she was retconned as having been first known as Tigress. She, in this continuity, had been a member of the young Golden Age era super team the Young All-Stars. When she meets Sportsmaster, she has become a villain and calls herself Huntress. She and Sportsmaster called themselves Mr. and Mrs. Menace and fought the Golden Age Black Canary and the Golden Age Starman. Artemis Crock was the third Tigress. She is the daughter of Paula Brooks and Crusher Crock (Sportsmaster). She was introduced in Infinity Inc. #34 (Jan 1987) by Roy Thomas and Todd McFarlane. She originally went b the name Artemis then later became Tigress. A version of this character was seen as a hero on Young Justice the Animated series from 2010-2013. It is hard to say which version Tabitha is supposed to be based on.
The Flash Season 2 Episode 21: Runaway Dinosaur
Girder AKA Tony Woodward was created by Geoff Johns and Ethan Van Sciver in Flash: Iron Heights (2001). Woodward caused a riot at the steel plant he worked and was thrown into a vat of molten metal when he attempted to assault a female co-worker. The metal had scraps from S.T.A.R. labs experiments. He ended up become a metallic being with super strength. He was a member of the Blacksmith’s Rogues.
Arrow Season 4 Episode 21: Monument Point
Brick AKA Daniel “Danny” Brickwell was first presented in Green Arrow vol. 3 #40 (September 2004) by Judd Winick and Phil Hester. In the comics, he is an African-American with red stony skin; he had some invulnerability and super strength. Brick was the head of a criminal empire in Star City. In the New 52 he is among the Longbow Hunters who are out to kill the Green Arrow.
DC’s Legends of Tomorrow Season 1 Episode 15: Destiny
Thanagar was created by Gardner Fox and Joe Kubert in Brave and the Bold #34 (March, 1961). It is a planet in Sector 2682 and home of the Thanagarians. It is policed by the Hawk-Police/ Wingmen. Thanagar is a war-like militaristic planet Post-Crisis and post Flashpoint. Among the famous Thanagarians are the Silver Age Hawkman and Hawkwoman.