SIDE-BY-SIDE With SUB-MARINER!
1st Appearance "ATTUMA"
After examining a strange aquatic creature given to Reed by the Coast Guard, Johnny arrives with Lady Dorma, who has come asking the FF's help to protect Atlantis from Attuma a rogue Atlantian Warrior who is trying to usurp Namor's rule.
Traveling to Atlantis, the FF battle Attuma's forces, and when Namor battles Attuma in one-on-one combat, it's Sue's invisibility powers which help Namor turn the tide of battle to his favor. Retreating before the battle is over because their Oxo-spray is wearing off, the FF are unable to see the conclusion of the battle where Attuma is defeated and taken prisoner.
Reaching the surface the FF use Reed's body as a life raft and wonder how they're supposed to get home.