The X-Men (vol 1) #152 VF

Pursued by Emma Frost (in Storm’s body), Storm (in Emma’s body) makes her escape from the Massachusetts Academy with Kitty Pryde. Kitty awakens and is frightened, thinking that Storm is Emma. She attempts an escape and Storm’s efforts to stop her result in the car going off the road and down an embankment. Kitty falls separately, protected by her phasing power, while the car explodes upon impact. Emma leaves, thinking them both dead. Kitty finds what she thinks to be the body of Emma Frost, lying just outside the fire from the car’s explosion. Though Kitty does not believe her at first, Storm manages to convince Kitty to help her, since she cannot take the risk of the other X-Men being in danger. Meanwhile, the other X-Men, still thinking that Emma Frost is dead from an early...