Avengers #137 (Marvel, 1975 — Cover A)

With Swordsman and Mantis gone, and Vision and Scarlet Witch taking time off for married life, the Avengers must recruit some new heroes! After extending invites to past members Yellowjacket and Wasp, the Avengers decide to hold an open call at Shae Stadium. While testing potential member Beast, the Avengers are attacked by "The Stranger", an alien creature seeking the Scarlet Witch.