Mark two lines on opposite sides of the play space. Choose one player to be Captain America. Have Captain America stand in the middle between the two lines. The remaining players are The Avengers who must stand behind one of the lines.
At the start of the game, all of the The Avengers must cross from behind one line to behind the other line without being tagged by Captain America. Any players tagged by Captain America will join his team and must stand in the middle as well. The Avengers must cross again to the other side, trying not to get tagged by Captain America or their new team members. Play continues like this until all of The Avengers have join sides with Captain America.