Fantastic Four #214 (1979)

and Johnny's teammates come back younger and more vital than ever., and takes the Skrull aging ray from this Skrull. Waking Reed, but Stark is working with radioactive waste for S.H.I.E.L.D. and cannot come out without lengthy decontamination. Johnny returns to the Baxter Building, Johnny is left, only to face off against Skrull X, the robot Skrull that first attacked them way back when this saga started in issue 204. Johnny wins the battle, they modify the device to reverse the process, with the other three in stasis. He tries to get help from Tony Stark