In the early 1980s, the Wild Samoans joined the World Wrestling Federation (WWF). They made their Madison Square Garden debut on January 21, 1980 in a WWF Tag Team Championship match against Tito Santana and Ivan Putski, who retained their title. In the upcoming months, both men became contenders for Bob Backlund's WWF Championship, but neither man won the gold. They, however, won their first championship in the WWF, the tag team championship, by defeating Santana and Putski on April 12, 1980. They reigned as champions for approximately five months, until dropping the title to Backlund and Pedro Morales in a two out of three falls match at Showdown at Shea. Because Backlund was already the reigning WWF Champion, the team had to forfeit the title, and a tournament was held to crown new tag champions. On September 8, 1980, the Wild Samoans defeated Tony Garea and Rene Goulet in the tournament finals to win the title. Their reign lasted for one month, until they lost to Garea and his new partner, Rick Martel. The Wild Samoans feuded with the champions for the rest of the year, but they were not able to recapture the gold.
The Wild Samoans eventually ended up back in the World Wrestling Federation with their former manager Capt. Lou Albano. Afa and Sika began their third WWF Tag Team Championship reign on March 8, 1983 by defeating Chief Jay and Jules Strongbow. In a rematch on March 19, they were also victorious. Also during this time, while feuding with Rocky Johnson, Jimmy Snuka, and André the Giant, the duo added Afa's son Samula to their team, first as a replacement for Sika when he got hurt, then as their backup upon his return.
They lost their tag team title to the team of Rocky Johnson and Tony Atlas on November 15. During the match, Albano tried to interfere on the Samoans behalf by attempting to hit Johnson over the head with a chair. He accidentally hit Sika instead, however, and Atlas covered him for the win. The North-South Connection, Adrian Adonis and Dick Murdoch, would later defeat Atlas and Johnson for the tag titles on April 17, 1984. The Samoans turned face and challenged them in a lengthy feud. After failing to regain the belts, the duo eventually left the WWF in 1984.
In 1987 Sika reappeared briefly in the WWF, now managed by Mr. Fuji, performing both in singles competition and as a tag team (partnered with Kamala). Kamala and Sika's biggest match as a tag team was a loss to the Can-Am Connection on Superstars of Wrestling. Sika also participated in the invitational battle royal that opened Wrestlemania IV. He was the second one eliminated, however.
In 2007, on the eve of WrestleMania 23, the Wild Samoans were inducted into the WWE Hall of Fame. They were inducted by their sons Samula and Rosey.