The Saiyan Adopted by Thanos

After Emperor Frieza of a certain Dragon Ball parallel universe detonated Planet Vegeta, the home of the Saiyans, an infant placed in an escape pod by his mother, by a strange twist of fate, arrived in a brand new world.

On the desolate planet Titan, Comrade Thanos, Director of the Universal Population Control Committee, gazing at the gloomy starry sky, unexpectedly discovered a survivor after the demise of Titan civilization—an infant with a tail growing from his backside...

"Survivor of Titan, from this day forward, you are my son."

P.S. This is a product of a brainstorm with a friend after watching Avengers 4, so everything is based on the cinematic universe.