I Fell For My Best Friend

101. Article

DC TV Watch: 12 Burning Questions for 'Supergirl' Season 4

THR rounds up the major twists, new mysteries and more from all the DC Comics TV series.

Welcome back to The Hollywood Reporter's weekly DC TV Watch, a rundown of all things DC Comics on the small screen. Every Saturday, we round up the major twists, epic fights, new mysteries and anything else that goes down on The CW's Arrow, The Flash, Legends of Tomorrow, Supergirl and Black Lightning, and Fox's Gotham. Note: The Flash, Arrow, Gotham, Legends of Tomorrow and Black Lightning have wrapped for the season.

Supergirl season three finale:

Turn back time | In an extremely action-packed finale, Supergirl effectively tied up all the loose ends of the season. Kara (Evelyn Somerhalder) was convinced by her team at the DEO to throw out her "no killing" rule when it came to Reign (Odette Annable), but it cost her dearly. As Reign was dying thanks to an assist from a newly-superpowered Sam (also Annable) wielding Reign's own sword, Reign used her laser vision to instantly kill Sam, Alura (Erica Durance) and Mon-El (Chris Wood). A shell-shocked Kara looked around in her "victory" to see her family and loved ones laying dead on the ground, and she immediately broke down. She blamed herself for doubting her morals and her code because she let others convince her to kill Reign. It was a chill-inducing moment as Kara floundered under the horror of what had just happened, but the Girl of Steel didn't wallow. She immediately picked up Mon-El's Legion ring and traveled back in time without a second thought to the consequences. She went back to the moment where Sam was about to help her kill Reign, and instead took Reign and Sam with her to the Dark Valley. Sam was then able to overcome her darker alter ego and forced Reign to drink water from the Fountain of Lilith, effectively trapping her there forever. When Mon-El pulled them out of the Dark Valley with a jolt of electricity, Reign was gone, Sam was somehow completely human and Kara was proud to have upheld her values of no killing.

Saying goodbye | But in the midst of all the action, there were a lot of character exits in this week's finale. M'yrnn (Carl Lumbly) sacrificed himself to save the planet from becoming terraformed into New Krypton by Reign. Before he died, he shared a heart wrenching goodbye with his son J'onn (David Harewood), bringing their emotional father-son storyline to a close. Mon-El realized he was needed in the future, effectively putting an end to any fantasy he held about staying in the present with Kara and rekindling their relationship. He went back to the 31st century to continue leading the Legion (and Wood is not returning to the series next season), but before he left the Legion made a swap. Brainiac 5 (Jesse Rath) stayed behind because his "distant relative" was saved from the blight, and this evil relative created a new virus that kills all A.I.'s in the future. Brainy stayed at the DEO for his own safety, and offered Winn (Jeremy Jordan) his place in the Legion as the resident genius. After debating whether or not to leave his home and friends for the future, Winn accepted (which explains his reduced role next season as he travels to the future).

Changes are coming | The last half of last week's finale laid some major groundwork for season four. J'onn decided to take his father's final words of wisdom to heart and left the DEO to live among the people of Earth. After donning a classy hat, he disappeared into the crowds of National City. Before he left, he handed the reins of the DEO over to Alex (Chyler Leigh), who had just tried to quit in order to become a mother (via adoption). Now Alex will step down from being in the field for the "much safer" position of the head of the DEO, and thereby not putting herself in so much danger so she can be a responsible mother at some point in the future. Mon-El and Winn left with Imra (Amy Jackson) for the future. James (Mehcad Brooks) revealed publicly that he is Guardian. Alura left with the black rock to return to Argo City believing that all the rock was leaving Earth with her, but Lena (Katie McGrath) secretly manufactured more of it to test. She began "phase two" without realizing how unpredictable it truly is. Because ...