Men in Black: The Series (1997)

S3E1 The Worm-Guy Guy Syndrome

Two law enforcement agents from Kalifadik start delivering justice on Earth by using teleportation guns to send offenders to an alien prison. In the midst of their actions, MIB intervenes, but during the chaos, Jay and one of the worms accidentally intersect while teleporting, resulting in a bizarre transformation where they gradually take on each other's characteristics.