It's a Super Life

"I recognize I made a mistake in hiding my identity from you for so long, but the past is the past, and I can't change it. Forgive me or not, that's your choice."

- Supergirl to Lena Luthor

Synopsis
Mxyzptlk returns with a proposition for Kara – what if she could go back in time and tell Lena her secret before Lex did, would things turn out different? Looking back over key moments throughout the series, Kara must decide if she wants to change history to become friends with Lena again. Familiar faces return in this special episode.

Protagonists

 * Super Friends
 * Kara Danvers/Supergirl (Kara Zor-El)
 * Alex Danvers
 * John Jones (J'onn J'onzz)
 * Mxyzptlk
 * Lena Luthor

First Alternate Timeline

 * Kara Danvers (Kara Zor-El)
 * Lena Luthor

Second Alternate Timeline

 * Super Friends
 * Kara Danvers/Supergirl (Kara Zor-El)
 * Martian Manhunter (J'onn J'onzz)
 * Lena Luthor
 * Sam Arias

Third Alternate Timeline

 * Super Friends
 * Supergirl (Kara Zor-El)
 * Alex Danvers
 * Lena Luthor
 * Martian Manhunter (J'onn J'onzz)
 * James Olsen
 * Winn Schott
 * The Legion
 * Mon-El
 * Saturn Girl (Imra Ardeen)

Fourth Alternate Timeline

 * Super Friends
 * Kara Danvers/Supergirl (Kara Zor-El)
 * Alex Danvers
 * Martian Manhunter (J'onn J'onzz)
 * The Legion
 * Mon-El
 * Toyman/Computer Lad (Winn Schott)
 * Dreamer (Nia Nal)
 * Guardian (Kelly Olsen)

Antagonists

 * Worldkillers
 * Pestilence
 * Lex Luthor
 * Lillian Luthor

Second Alternate Timeline

 * Mercy Graves
 * Lillian Luthor
 * Lex Luthor
 * Reign
 * Agent Liberty

Third Alternate Timeline

 * Worldkillers
 * Reign (Sam Arias)
 * Rhea
 * Lex Luthor

Fourth Alternate Timeline

 * Agents of Liberty
 * Agent Liberty (Ben Lockwood)
 * Otis Graves
 * L-Corp
 * Lex Luthor
 * Lillian Luthor
 * Metallo (Lena Luthor)
 * Hope
 * Reign (Sam Arias)
 * Brainiac 5 (Querl Dox)

Other Characters

 * Zook
 * William Shakespeare

Third Alternate Timeline

 * Patricia Arias

Fourth Alternate Timeline

 * James Olsen
 * Superman
 * Thomas Coville
 * Rao
 * Pete
 * Peter Lockwood
 * Lydia Lockwood
 * George Lockwood
 * Cat Grant
 * Hat

Teams and Organizations

 * Stilton Pizza
 * Myxflyx
 * Luthor Corp
 * Beta-Myx

Second Alternate Timeline

 * L-Corp
 * Big Belly Burger
 * DEO

Third Alternate Timeline

 * DEO

Fourth Alternate Timeline

 * L-Corp
 * DEO
 * Cult of Rao
 * Daily Planet
 * CatCo Worldwide Media
 * 3 News
 * Agents of Liberty
 * NCPD

Species

 * Kryptonian
 * Humans
 * Green Martian
 * Imp

First Alternate Timeline

 * Human
 * Kryptonian

Second Alternate Timeline

 * Humans
 * Kryptonian
 * Green Martian

Third Alternate Timeline

 * Humans
 * Kryptonian
 * Daxamite
 * Titanians
 * Green Martian

Fourth Alternate Timeline

 * Humans
 * Kryptonians
 * Daxamite
 * Coluans
 * Human-Naltorian Hybrid
 * Green Martian
 * Artificial Intelligence

Objects and Concepts

 * Kara Danvers' Glasses
 * Supergirl Suit
 * Kal-El's Blanket
 * Myriad
 * Project Non Nocere
 * Inter-Dimensional Wi-Fi

First Alternate Timeline

 * Kara Danvers' Glasses
 * Lena Luthor's Private Jet

Second Alternate Timeline

 * Kara Danvers' Glasses
 * Supergirl Suit
 * Kal-El's Blanket
 * Kryptonite
 * Martian Manhunter Suit

Third Alternate Timeline

 * Kryptonite
 * Supergirl Suit
 * Kal-El's Blanket
 * Timeships
 * Legion Cruiser
 * Reign Suit
 * Power-Dampening Cuffs
 * Device
 * DEO Protective Suit
 * Legion Suit
 * Legion Suit (Mon-El)

Fourth Alternate Timeline

 * Kara Danvers' Glasses
 * Kryptonite
 * Supergirl Suits
 * Martian Manhunter Suit
 * Reign Suit
 * Medusa Virus
 * Agent Liberty Suit
 * DEO Protective Suit
 * Lexosuit
 * Dreamer Suit
 * Luthor Law
 * Fifth Dimensional Hat
 * Brainiac 5 Suit
 * Image Inducer
 * Life Projectors
 * Guardian Shield
 * Staff of H'ronmeer
 * Legion Ring
 * Sword of Juru
 * Legion Suit
 * Legion Suit (Mon-El)
 * Dream Energy

Locations

 * Earth-Prime
 * Earth
 * North America
 * United States of America
 * California
 * National City
 * Hammersmith Tower
 * Kara Danvers' Loft
 * Fortress of Solitude
 * Fifth Dimension

First Alternate Timeline

 * Earth-Prime
 * Earth
 * Europe
 * Kaznia

Second Alternate Timeline

 * Earth-Prime
 * Earth
 * North America
 * United States of America
 * California
 * National City
 * L-Corp Office
 * Metropolis

Third Alternate Timeline

 * Earth-Prime
 * Earth
 * North America
 * United States of America
 * California
 * National City
 * DEO National City Headquarters
 * Patricia Arias' House

Fourth Alternate Timeline

 * Earth-Prime
 * Earth
 * North America
 * United States of America
 * California
 * National City
 * National City Hall
 * DEO National City Headquarters
 * Hammersmith Tower
 * Kara Danvers' Loft
 * L-Corp Office
 * CatCo Plaza
 * Tower
 * Mardi Gras
 * Krypton