The Flash #115

The Flash Vol. 1 #115 (1960)

This is the classic Silver Age issue with the famous "Fat Flash" cover.

• Key Fact: Second appearance of Ralph Dibny, the Elongated Man.
• Key Fact: Features Gorilla Grodd as the main antagonist.
• Synopsis:
  • "The Day Flash Weighed 1,000 Pounds!": Gorilla Grodd escapes from Gorilla City by projecting his mind into a human named William Dawson. He uses a high-tech "weight-gun" to cause the Flash to instantly gain 1,000 pounds of water weight. Barry Allen must find a way to stop Grodd while being physically unable to run and suffering from temporary amnesia.
  • "The Elongated Man's Secret Weapon!": Ralph Dibny travels to the Yucatan to find more of the rare "Gingo" fruit that gives him his powers. He teams up with the Flash to stop a group of tiny aliens who are using a shrinking ray to prepare for an invasion of Earth.

Option 2: The Flash Vol. 2 #115 (1996)

This is part of the "Race Against Time" storyline.

• Key Fact: Part 3 of the "Race Against Time" arc.
• Synopsis:
  • "Speed Metal": Wally West is still lost in the timestream, this time landing in the 27th century—the home era of John Fox. Meanwhile, in the present, John Fox continues to "replace" Wally, fighting the villain Chillblaine and growing closer to Wally’s girlfriend, Linda Park.