The Incredible Hulk Vol. 1 (1962-1999) #259

Plot

While Vanguard, Darkstar and Ursa Major keep Sergei the Presence and the Red Guardian busy, Bruce Banner and Professor Phobos finish a device that is capable of imprisoning the god-like beings. After locking Sergei and the Red Guardian, Phobos reveals his true motives: Contaminate Russia and the rest of the world. Phobos defeats Vanguard and Darkstar. But Sergei disables the transformation blockage he set in Banner and Major Ursa, who turn into their bestial selves and easily defeat Phobos.