Wigan have completed the high-profile signings of Thomas Leuluai, Michael Withers and Shane Millard.
New Zealand scrum-half Leuluai, 21, has joined on a three-year deal from Harlequins and is already being tipped for stardom by Brian Noble.
"He is only young and will hopefully be set for a long and successful career at Wigan," said the Warriors coach.
Former Bradford full-back Withers, 30, and ex-Widnes and Leeds hooker Millard, 31, have signed two-year contracts.
Withers, who made 170 appearances for the Bulls, teams up again with his former boss Noble and is expected to take over the full-back role from youngster Chris Ashton.
"It's always special for any rugby league player to sign for Wigan and I am looking forward to joining up with Brian Noble again," said Withers.
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Millard fills the gap caused by the departure of back-up hooker Wayne Godwin to Hull FC.
Leuluai is a direct replacement for scrum-half Michael Dobson, who has returned to Australia.