The Undertaker will be on the USA network later this year.
On the WWE website, the Undertaker has been advertised for the Smackdown on October 16th in Washington DC. He has appeared on WWE programming a few times this year including WrestleMania, the Greatest Royal Rumble, and the 25th Anniversary of Raw. In July, the Undertaker was in a match at a WWE live event at Madison Square Garden.
The October 16th episode of Smackdown is also the 1,000th episode of Smackdown which WWE will be celebrating. WWE announced the 1,000th episode on Monday.
It should be noted that WWE has advertised some wrestlers on the website in the past who were later inexplicably removed before the event. The other wrestlers advertised for October 16th include Smackdown roster members like Daniel Bryan, AJ Styles, Carmella, and the New Day.