The YouTuber boxer began the night by knocking out Swarmz who, to his credit, took the fight at short notice and was challenged with losing 12kg in 20 days.
KSI dropped his opponent in the first round before stopping him in the second.
Later in the night, the Brit closed out the show with a comfortable third-round TKO victory over Luis Alcaraz Pineda.
The low-level professional boxer was down three times in the first round, twice in the second and found the canvas two more times in the third before the referee called an end to the bout.
Speaking after his second win of the night, KSI said: "Ladies and gentlemen, are you not entertained?
"It's good to be back. Two fights, one night, two KO's. I talked the talk and I walked the walk."
KSI then called out a number of names, including Slim Albaher, who knocked out FaZe Temperrr earlier in the night.
The 29-year-old went on to list a number of names but the one which garnered the biggest reaction was Andrew Tate.
The former kickboxer was recently banned by a host of social media companies over his controversial views.
In recent months, Tate has become one of the most searched individuals on the internet, and has previously spoke about KSI on his own videos.
Another name mentioned by KSI was Tommy Fury. The half-brother of world heavyweight champion Tyson Fury was scheduled to face Jake Paul before withdrawing due to travel issues.