Nickson appeared on 19th season of Big Brother. He began a showmance with fellow contestant Jessica Graf. On Day 1, he won the safety competition after Paul did not choose him as one of the 8 HouseGuests to be awarded immunity. He won Head of Household later that week, becoming the first HOH of the season. He nominated Megan and Jillian for eviction. On Day 9, he had to name a replacement nominee and picked Alex after Megan self-evicted herself from the game. After Alex won POV and took herself off the block he tried to nominate Paul. However, Paul revealed his Pendant of Protection, leaving Nickson to nominate Christmas instead. During week 2 Paul won HOH as well as Power of Veto and chose Nickson as a replacement nominee after saving Josh his previous nominee from the block. He endured the Ve-toad curse temptation after Christmas accepted the Temptation offer voted by America. He was evicted from the house on Day 23. Nickson later returned to the house after winning three rounds of the Battle Back Showdown during week 4. During week 5 Paul nominated Cody for eviction alongside Jessica but she used the Halting Hex saving them both from eviction. He won the second Temptation Competition the next week and became safe. He was named as a replacement nominee by Alex during week 7. He was evicted on day 58 and became the first member of the Jury. He voted for Josh to win Big Brother and won America's Favorite HouseGuest with a prize of $25,000.
''Big Brother 20''
Nickson, alongside Graf appeared on Big Brother 20 to host the second POV competition.
''The Amazing Race''
Nickson and Graf also participated in the 30th season of the U.S. television series The Amazing Race. They later became the winners of the season and took home the $1,000,000 prize along with a $5,000 prize they won earlier during the season, becoming the first former Big Brother contestants to win the Amazing Race.
Personal life
He became engaged to Jessica Graf on February 13, 2018. He has a daughter from a previous relationship. In September 2018, Nickson and Graf announced that they were expecting their first child together, and confirmed the following month that they'd be having a girl. Nickson and Graf got married on October 13, 2018. Their daughter Maverick was born on March 17 2019, four weeks premature. In May 2020, Nickson and Graf announced that they were expecting their second child together.