After Frieza, the emperor of a parallel Dragon Ball universe, blew up Planet Vegeta, home of the Saiyans, a baby placed in an escape pod by his mother wound up in a brand-new world by a twist of fate.
On the desolate planet Titan, Comrade Thanos, director of the Universal Family Planning Commission, was gazing at the gloomy starry sky when he unexpectedly discovered a survivor of the fallen Titan civilization: a baby with a tail growing out of its backside...
"Survivor of Titan, from now on, you are my son."
P.S. This idea came to me after watching Avengers: Endgame with a friend, so everything follows the Marvel Cinematic Universe.