"Thieves in the Temple"
Storm has been hired by Black Tom to help get back the gem that feeds Juggernaut's powers. Juggernaut's powers were stolen from him and placed into another crystal, the results are that Juggernaut is dying. Storm and Kitty Pryde go to find Juggernaut and run into Gambit, who is looking for the same gem. The trio end up on an island near South Korea and have to fight their way through hundreds of worshippers to find the gem but Gambit takes it before Storm can reach the gem. In the end, Gambit gives the gem back to Black Tom and restores Juggernaut's powers but Gambit will not return to the X-Men.
The Return of Gambit.